INFLUENCE OF ORIGIN ON MILK PRODUCTIVITY AND REPRODUCTIVE PROPERTIES OF SYCHEVSKAYA BREED COWS

2020 ◽  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Mass Fraction ◽  
Milk Protein ◽  
Live Weight ◽  
Reproductive Function ◽  
Milk Productivity ◽  
Holstein Bull ◽  
Productivity Indicators ◽  
Weight Coefficients

The results of researches on studying of sires influence on milk production and reproductive properties of Sychevskaya breed cows, bred in the breeding farm, JSC "Vostok", Smolensk region. In order to determine sires, cows, which are able to increase milk productivity of the herd without compromising reproductive properties, population of full-aged cows, according to their origin, was divided into six groups. Their milk yield was analyzed for first and third lactations, mass fraction of milk fat and milk protein, live weight, coefficients of milk yield of cows and the sustainability of lactation. The most stable, in all groups, is the first lactation, then there is a decrease to the fifth lactation. Cows received from the bull of Sychevskaya breed Pyl 6782, for the first lactation have a productive advantage over livestock received from other bulls. In full-aged animals derived from this bull, this advantage is lost. The daughters Hanke 6749, Holstein red-and-motley breed, have intensively promoting milk productivity, indicators of milk fat and protein is higher in daughters of Holstein bull Marder 6721. Reproductive properties were studied: open days and calving interval, age at first calving, days to first fertilization in lactation. The best reproductive properties have Sychev bulls. After calving, reproductive function in daughters Naliv 6791(sychevskaya breed) were restored earlier, in daughters Hanke 6749 - for longer period. The correlation of signs is defined: milk yield between lactations, milk productivity with mass fraction offat%, live weight, age of the first calving, the period of days before the first insemination in lactation.

Study of indexes of the suckling productivity the cows of Ayrshire breed of tribal economy of the Leningrad area.

2020 ◽  
Vol 2 ◽  
pp. 148-154
Author(s):  
Yu. V. Mukiy ◽  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Mass Fraction ◽  
Milk Protein ◽  
Milk Productivity ◽  
Ayrshire Breed ◽  
Selection Of

In this article, studies the dynamics of indicators of the main signs of milk productivity over 305 days 7 lactations in 240 cows of the Ayrshire breed. The average values for milk yield, the mass fraction of fat and protein, the amount of milk fat and protein, the range between the maximum and minimum values were calculated and studied, and the stand-ard deviation according to the characteristics stud-ied was established. The average milk yield was higher in the 5th and 6th lactation and amounted to 8412 kg and 8962 kg; the maximum% of fat was in the 7th lactation - 4.2%, and% of the protein in the second - 3.46% and also in the last 7th lactation -3.43%. The value of the mass fraction of fat was maximum in the 1st lactation - 1.2; and the mini- mum at the 6th lactation is 0.05. The value of the mass fraction of protein was maximum in the sec-ond - 0.74 and minimum in the 7th lactation -0.24. He overall picture for these indicators represents the horizontal trend lines in the diagrams, which indicates a slight deviation of the values relative to the average for all lactations. The yield of milk fat and protein was maximum in the 6th lactation - 345.9 kg and 289.47 kg, respectively. The stand-ard deviation by milk was 568.6; by mass fraction of fat 0.09; by the mass fraction of protein 0.08; by the amount of milk fat 26.4; by the amount of milk protein 16.9; which means the uniformity of the average values for these indicators. It can be con-cluded that the selection of cattle in this complex was progressive, because led to stably high pro-duction in animals over 7 lactations.

scholarly journals Characteristics of half-siblings cows’ by growth and milk productivity

2019 ◽  
pp. 33-42
Author(s):  
V. Siriak ◽  
Y. Polupan ◽  
R. Stavetska
Keyword(s):  
Growth Rate ◽  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Live Weight ◽  
Milk Productivity ◽  
Daily Growth Rate ◽  
Daily Growth ◽  
G 12 ◽  
M Estimate

It is proved that the live weight of replacement heifers, the intensity of their formation and milk productivity in primiparous cows depends on father origin, in particular, the value of the index of live weight formation between groups of half-siblings ranges from 68,9 to 82.3 (for comparing ages 6–0 and 12–6 months), from 15,1 to 18,4 (6–3 and 9–6 months), from 23,8 to 28,6 (6–3 and 12–9 months); average daily growth rate in the age of 0–12 months – from 659 to 717 g, 12–18 months – from 500 to 585 g; live weight at the age of 12 months – from 367 to 399 kg; 305-day milk yield – from 5295 to 7595 kg, fat content in milk – from 3,70 to 3,78 %, protein content – from 3,23 to 3,34 %, milk fat – from 197 to 286 kg, milk protein – from 175 to 253 kg. Regardless of the method of determining the index of live weight formation, the higher values of them had daughters of sires M. Nirvana 101709244 (82,3; 18,3; 26,9, respectively), B. Buick 10789585 (80,0; 18,1; 28,6) and M. W. Tahoe 8189401 (80,1; 18,4; 27,7). There were determined differences (P < 0,001) between half-siblings by the average daily growth at the age 0-12 and 12-18 months. At the age of 0-12 months, the higher average daily growths showed daughters of sires M. W. Tahoe 8189401, Flame 112302008 and B. Buick 10789585 (on average 711 g), aged 12–18 months – daughters of sires M. Nirvana 101709244, N. Alfons 353588796, H. R. Artist 6284191 and H. Hadley 123055802 (on average 566 g). The higher intensity of growth of replacement heifers up to 12 months was not related to higher milk productivity in primiparous cows. The advantage of milk yield (+606…+1373 kg, P < 0,001), milk fat (+25…+54 kg, P < 0,001) and milk protein (+22…+48 kg, P < 0,001) was observed in daughters of sires M. Estimate 5925716 and N. Alfons 353588796, whose live weight at the age of 18 months did not exceed the average in the group. The low milk productivity (–525…–927 kg of milk compared to the average, –18…–44 kg of milk fat and –8…–30 kg of milk protein) were characterized for daughters of bulls Flame 112302008 and M. W. Tahoe 8189401, which had significantly higher intensity of growth and live weight formation. Based on the variance analysis it was established that the effect of parentage on the live weight of cows from birth to 18 months was 24,4–43,6 % of the total phenotypic variation, the average daily growth rate – 27,5–47,7 %, traits of milk productivity – 18,0–30,1 % with a high probability (P < 0,001) Key words: dairy cattle, parentage, half-siblings, the index of live weight formation, milk productivity, power of influence.

Milk productivity of the cows of Holstein and Simmental breeds in environment of the Novosibirsk region

2020 ◽  
pp. 41-49 ◽  
Author(s):  
A. Zheltikov ◽  
N. Kostomakhin ◽  
D. Adushinov ◽  
O. Zaiko ◽  
V. Dementev ◽  
...  
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
Fat Content ◽  
Milk Productivity ◽  
Holstein Breed ◽  
Novosibirsk Region ◽  
Daily Milk Yield

The characteristic of milk productivity of cows of Holstein and Simmental breeds in LLC “Sibirskaya Niva” in the Maslyaninsky district in the Novosibirsk region has been given. It has been revealed that under the natural and climatic environments of the Western Siberia, when creating favorable conditions for feeding and housing for cows of Holstein and Simmental breeds have sufficiently high milk productivity. It has been found that Holstein first-calf heifers surpassed their Simmental herdmates by 959 kg in milk yield for the first 305 days of lactation under the same conditions of housing and feeding, by 3,1 kg in daily milk yield, by 38,2 kg in milk fat yield, and by 28,3 kg in milk protein yield (P < 0,001). There were no statistically significant differences between animals of Holstein and Simmental breeds in terms of fat and protein content in milk, which amounted to 3,94 and 2,96 % in Holstein breed and 3,97 and 2,98 % in Simmental breed, respectively. Both breeds have shown high milk productivity during the first 3 lactations. Thus, the milk yield of Holstein cows for the first 3 lactation was 6475–9290 kg, Simmental cows it was 5516–7680 kg, fat content was 3,93–3,99 and 3,96–3,97 %, respectively. The protein content in the milk of cows of both breeds did not exceed 3,0 %. High variability has been found in milk yield, yield of milk fat and protein, the coefficient of milk content and duration of lactation, the lowest in the content of protein and fat in milk and live weight. The correlation coefficients between the fat and protein content in milk were generally positive, but did not exceed 0,28. Therefore, breeding in the herd of cows in LLC “Sibirskaya Niva” have to be conducted not only by fat content, but also by protein content in milk.

scholarly journals Influence of reproductive qualities on dairy productivity of cows of the Simmental breed

2021 ◽  
Vol 285 ◽  
pp. 04005
Author(s):  
Maria Grinchuk ◽  
Yulia Nesterova
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Mass Fraction ◽  
Milk Protein ◽  
Production Performance ◽  
Dry Period ◽  
Milk Productivity ◽  
Service Period ◽  
Positive Effect ◽  
Different Levels

The aim of work is to explore influence of first fruitful insemination, service period and dry period to dairy productivity of Simmental cows. The research is aimed at studying the milk production of Simmental cows with different levels of reproductive qualities. The result of the research, a relation was established between the age of the first fruitful insemination, the duration of the service period, the duration of the dry period and milk production performance. It has been established that the age of the first fruitful insemination at 18-24 months has the most beneficial effect on subsequent milk production. The service period of 90-120 days has a positive effect to an increase in milk yield per 305 days of lactation, the longer service period negatively affects to the mass fraction of fat. With an increase in the duration of the dry period, the mass fraction of fat increases, but milk yield decreases. The influence of reproductive qualities to the milk protein is negligible. It was revealed that the age of the first insemination at 18-24 months is the most profitable for production. According to the results of the research, it can be judged that reproductive qualities, in combination with other factors, affect the milk productivity of Simmental cows.

MILK PRODUCTIVITY OF BLACK-AND-WHITE CATTLE WITH DIFFERENT GENOTYPES OF PROLACTIN AND SOMATOTROPIN

2021 ◽  
pp. 21-25
Author(s):  
Л.Р. ЗАГИДУЛЛИН ◽  
Р.Р. ШАЙДУЛЛИН ◽  
Т.М. АХМЕТОВ ◽  
С.В. ТЮЛЬКИН ◽  
А.Б. МОСКВИЧЕВА
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Milk Productivity ◽  
Black And White ◽  
Gh Gene ◽  
White Cattle ◽  
Fat Yield ◽  
Prl Gene

Изучена взаимосвязь аллельных вариантов генов пролактина и соматотропина с показателями молочной продуктивности коров черно-пестрой породы по 1 и 3 лактации. У первотелок, как и у полновозрастных животных,  наиболее высокий удой (4642 и 6240 кг), количество молочного жира (174,1 и 215,0 кг) и молочного белка (149,0 и 182,5 кг) достигнуты в группе с генотипом PRL АА. По массовой доле жира и белка в молоке коровы с генотипом PRL ВВ достоверно превосходили животных с генотипом PRL АА на 0,12% (Р<0,05) и 0,05% (Р<0,05) соответственно. По гену соматотропина наибольший уровень молочной продуктивности выявлен у коров с генотипом GH LL при достоверном преимуществе над GH VV у первотелок по удою на 439 кг (Р<0,01), выходу молочного жира — на 13,6 кг (Р<0,001), выходу молочного белка — на 15,3 кг (Р<0,01). У полновозрастных коров превышение над остальными группами было только по удою — на 219—548 кг (Р<0,05). Наибольшая жирномолочность характерна животным с генотипом GH VV по 1 лактации — 3,83% и по 3 лактации — 3,82%, а лучшая белковомолочность — коровам, имеющим аллель V гена GH:  3,21 и 3,23% соответственно. Полученные данные свидетельствуют о более высоком уровне молочной продуктивности у коров с генотипом PRL АА и GH LL, но лучшая жирномолочность и белковомолочность отмечены у особей, имеющих в своем генотипе аллели В гена PRL и V гена GH. The interrelation of allelic variants of prolactin and somatotropin genes with indicators of milk productivity of black-and-white cows for the 1st and 3rd lactation was studied. The highest milk yield (4642 and 6240 kg) amount of milk fat (174.1 and 215.0 kg) and milk protein (149.0 and 182.5 kg) were in the group with the PRL AA genotype in first-calf heifers as well as in full-age animals. In terms of the mass fraction of fat and protein of milk, the cows with the PRL BB genotype significantly exceeded animals with the PRL AA genotype by 0.12% (P<0.05) and 0.05% (P<0.05), respectively. According to the somatotropin gene, the highest level of milk productivity was revealed in cows with the GH LL genotype with a significant advantage over GH VV in first-calf heifers in milk yield by 439 kg (P<0.01), milk fat yield by 13.6 kg (P<0.001), milk protein yield by 15.3 kg (P<0.01). The excess over the other groups in full-age cows was only in terms of milk yield that was by 219-548 kg (P<0.05). The highest protein content of milk is a characteristic of animals with the GH VV genotype, 3.83% is for the 1st lactation and 3.82% is for the 3rd lactation, and the best protein content of milk in cows with V allele of the GH gene is 3.21 and 3.23%, respectively. The obtained data  indicated a higher level of milk productivity in cows with the PRL AA and GH LL genotypes but the best fat and milk content was noted in cows with alleles B of the PRL gene and V of the GH gene in their genotype.

Influence of the age at the first insemination and live weight on milk productivity of cows

2020 ◽  
Vol 50 (2) ◽  
pp. 57-63
Author(s):  
L. L. Petrukhina ◽  
S. L. Belozertseva
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Live Weight ◽  
Reproductive Function ◽  
Reproductive Capacity ◽  
Milk Productivity ◽  
Black And White ◽  
Irkutsk Region ◽  
White Breed

The materials of the long-term (2008–2018) research into the reproductive function of cattle of the black-and-white breed of Baikal type in Irkutsk region are presented. The influence of the age at the first insemination and live weight on cows’ milk productivity, lifelong productivity and productive longevity was studied. The experiment was conducted on the basis of materials from the breeder-farm for breeding cattle of Baikal type on the groups of cows of different ages: up to 14–20 months and older. Cows inseminated at 16 months (7917 kg) had the best milk yield in the first lactation. The largest milk yield was obtained from inseminated cows with live weight of 401-410 kg. Milk production of these heifers was 7902 kg in the first lactation, 8792 kg – in the second and 8710 kg – in the third. It was revealed that age of cows and their live weight at the first successful insemination had a positive effect on the lifelong productivity and productive longevity of cows. Cows whose age at the first successful insemination was 15 or 16 months had a longer duration of productive use (productive life span of animals was 2561–2558 days, respectively). The highest lifelong productivity (34379–34585 kg) was obtained from the cows of this group. The economic efficiency of lifelong milk production was determined depending on the age of the first insemination. The highest lifelong milk productivity was obtained from cows, which were first inseminated at the age of 15–16 months. The largest revenue from sales of additional products was also received from the cows of this group (366,058–370,480 roubles per head). The results obtained allow to develop effective methods for increasing reproductive capacity of cattle.

Молочная продуктивность коров австралийской селекции разной линейной принадлежности

2019 ◽  
pp. 27-31 ◽  
Author(s):  
I.F. GORLOV ◽  
E.YU. ZLOBINA ◽  
A.A. KAIDULINA ◽  
T.N. BARMINA ◽  
S.A. SURKOVA ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Mass Fraction ◽  
Milk Protein ◽  
Holstein Cattle ◽  
Volgograd Region ◽  
Ideal Line ◽  
Calcium And Phosphorus ◽  
Selection Of

Приведены результаты исследований молочной продуктивности и качественных показателей молока коров голштинской породы австралийской селекции 3 линий в условиях Волгоградской области. Установлено, что наиболее высокий удой молока по 1й лактации был у коров линии Рефлекшн Соверинга 198998 7262,0 кг. В сравнении со сверстницами линий Вис Бэк Айдиала 1013415 и Монтвик Чифтейна 95679 он был выше, соответственно, на 84,3 и 351,1 кг. Лучший показатель содержания жира установлен в молоке коров линии Монтвик Чифтейна 95679 3,90. Валовой выход жира был больше у коров линии Рефлекшн Соверинга 198998 в сравнении со сверстницами линий Вис Бэк Айдиала 1013415 и Монтвик Чифтейна 95679 на 4,15 и 11,42 кг. Они же отличались и наибольшим выходом молочного белка.По наивысшей лактации бльшим удоем отличались коровы линии Вис Бэк Айдиала 1013415 7689,65 кг, которые превосходили по данному показателю сверстниц линии Рефлекшн Соверинга 198998 и Монтвик Чифтейна 95679, соответственно, на 134,5 и 252,17 кг. От них молочного жира было получено больше в сравнении со сверстницами линий Рефлекшн Соверинга 198998 и Монтвик Чифтейна 95679, соответственно, на 4,42 и 9,65 кг, массовая доля белка в молоке коров этой линии была выше, соответственно, на 4,12 и 7,42 кг. Казеина содержалось больше в молоке коров линии Вис Бэк Айдиала 1013415 по сравнению со сверстницами линий Рефлекшн Соверинга 198998 и Монтвик Чифтейна 95679 на 0,02 и 0,05, продолжительность сычужной свертываемости молока у них была короче, соответственно, на 1,40 и 1,15 мин. Содержание кальция и фосфора в молоке анализируемых линий находилось в пределах физиологической нормы. Целесообразно и перспективно более широкое использование животных линий Вис Бэк Айдиала 1013415 и Рефлекшн Соверинга 198998.The article presents the results of studies of milk production and quality indicators of milk of cows of the Australian selection of Holstein cattle of three lines in the conditions of the Volgograd region. It was established that the highest milk yield in the first lactation was in cows of the Reflection Sovering line 198,998 7,262.0 kg. In comparison with the peers of the lines of Vis Back Ideal 1013415 and Montwick Chieftain 95679, it was higher by 84.3 and 351.1 kg, respectively. The best indicator of fat content is set in the milk of cows of the Montwick Chieftain line 95679 3.90. The gross yield of fat was greater for cows in the Reflection Line of Sovering 198998 compared with the peers of the lines of Vis Back Ideal 1013415 and Montwick Chieftain 95679 by 4.15 and 11.42 kg. They also differed in the highest yield of milk protein. In terms of the highest lactation, the cows of the Vis Back Ideal line 1013415 7689.65 kg differed in terms of high milk yield, which surpassed in this indicator the contemporaries of the Reflection Sovering line 198998 and Montwick Chieftain 95679, respectively, by 134.5 and 252.17 kg. Milk fat was obtained from them in comparison with the peers of the Reflection Sovering lines 198998 and Montwick Chieftain 95679 by 4.42 and 9.65 kg, respectively, the mass fraction of protein in the milk of cows of this line was higher respectively by 4.12 and 7.42 kg. There was more casein in milk of cows of the Vis Back Ideal line 1013415 compared to the peers of Reflection Sovering 198998 and Montwick Chieftain 95679 peers by 0.02 and 0.05, the duration of rennet coagulability of milk was shorter by 1.40 and 1.15, respectively min The content of calcium and phosphorus in the milk of the analyzed lines was within the physiological norm.Consequently, it is expedient and promising to use the animal lines of the Vis Back Ideal 1013415 and Reflection Sovering 198998.

scholarly journals Inheritance of allelic variants of the kappa-casein gene by cows

2020 ◽  
Vol 17 ◽  
pp. 00059 ◽  
Author(s):  
Radik Shaidullin ◽  
Gazimzyan Sharafutdinov ◽  
Anastasia Moskvicheva ◽  
Tagir Faizov ◽  
Yusupzhan Yuldashbaev
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Mass Fraction ◽  
Milk Protein ◽  
Frequency Of Occurrence ◽  
Allelic Variants ◽  
Casein Gene ◽  
Black And White ◽  
White Cattle ◽  
Pcr Diagnostics

The inheritance of allelic variants of the kappa-casein gene from bulls with different genotypes and their influence on the milk production of daughters were studied. For research, PCR diagnostics of daughters in the herds of black-and-white cattle at the farms “Azeleevo” and “Vakhitovo” (OJSC “Red East Agro”) was carried out, the fathers were two bulls LADDIE 135797213 with a genotypes CSN3 AB and LOMAX 10785322 with a genotype CSN3 BB. Based on the results of genotyping, the frequency of occurrence of genotypes AA, AB, BB kappa-casein and allelic variants A and B in daughters was calculated. The bull with the CSN3 AB genotype produced the largest number of offspring with the CSN3 AA genotype 50.0-51.8 %, and the bull with the homozygous BB genotype produced 24–25 % of daughters carrying the BB variant and 75 -76 % of the AB genotype. The frequency of occurrence of the Kappa-casein allele in the daughters of bulls with the genotype CSN3 BB was 0.63, which is almost 2 times more than the allele A. When comparing heifers with the same genotype (CSN3 AB), it was found that at the Azeleevo farm, the daughters of the bulls having the genotype BB of kappa-casein are superior to cows born from bulls with the genotype AB by the milk yield (+36 kg), mass fraction of fat and protein (+0.01 %), the amount of milk fat (+2 kg) and protein (+2 kg). In the group of first-calf heifers with the BB genotype, daughters of the producer with the BB genotype are superior by the milk yield (+ 175 kg), the mass fraction of fat in milk (+0.1 %), the amount of milk fat (+12 kg), the mass fraction of protein in milk (+0.09 %), the amount of milk protein (+11 kg). At the Vakhitovo farm, similar results in the group of CSN3 AB heifers born from the bulls with the BB genotype was observed

Complete diets for dairy cows: the effect of energy concentration and change in energy concentration of a complete diet on intake and performance of lactating dairy cows

1984 ◽  
Vol 103 (2) ◽  
pp. 323-331 ◽  
Author(s):  
R. H. Phipps ◽  
J. A. Bines ◽  
R. F. Weller ◽  
Joanne Thomas
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Milk Fat ◽  
Protein Concentration ◽  
Milk Protein ◽  
Live Weight ◽  
Energy Concentration ◽  
Grass Silage ◽  
Complete Diet ◽  
The Mean

SUMMARYNinety-two British Friesians (56 cows and 36 heifers) were divided into two groups during weeks 3–10 of lactation and received ad libitum either complete diet H (65% concentrates, 35% grass silage, 11·7 MJ ME/kg D.M.) or diet M (50% concentrates, 50% grass silage, 11·2 MJ ME/kg D.M.). In weeks 11· 20 half the animals of each group continued to receive the same diet (HH or MM) while the other half were changed from diet H to M (HM) or from diet M to L (ML). Diet L contained 35% concentrates, 65% grass silage and 10·7 MJ ME/kg D.M. The crude protein concentration of all diets was maintained at about 157 g/kg D.M. by the addition of soya-bean meal to diets M and L.During weeks 3–10 the mean D.M. intake (kg/day), milk yield (kg/day), milk protein (g/kg) and live-weight change (kg/day) for animals on diets H and M were 15·0, 21·7, 33·3, 0·50 and 12·9, 20·2, 31·5, 0·35 respectively. Differences were significant for D.M. intake, milk yield and milk protein concentration. Although milk-fat concentration of cows given diet H (40·2 g/kg) was similar to that of cows given diet M (39·9 g/kg), heifers receiving diet H had a significantly lower value (37·0 g/kg) than those given diet M (39·8 g/kg).When animals were changed from diet H to M or from M to L at week 11, D.M. intake, milk yield and milk-protein concentration decreased. However, milk-fat concentration and live-weight change were generally unaffected.During the complete experimental period, weeks 3–20, animals on treatments HH, HM, MM and ML had mean D.M. intakes and milk yields of 15·3, 14·2, 13·2, 12·4 kg/day and 19·7, 18·5, 17·8, 17·0 kg/day. Milk-protein concentration, was closely related to D.M. intake, but only with heifers did diet H significantly depress milk-fat concentration. The highest live-weight gain was recorded on treatment HH (0·40 kg/day) and the lowost on treatment ML (0·29 kg/day) with intermediate values for treatments HM and MM.In vivodigestibility coefficients of D.M. and organic matter for diet H (0·731, 0·757) were significantly higher than those of diet L (0·707, 0·734) with intermediate values for diet M. However, for acid-detergent fibre the digestibility coefficient for diet H was significantly lower (0·562) than for diet L (0·662). The digestibility coefficients for nitrogen in all three diets were similar.Estimates of mean efficiency of utilization of ME for lactation were made on a weekly basis and were 0·56 and 0·64 for animals on diets H and M in weeks 3·10. During weeks 11·20 the mean values for animals on treatments HH, HM, MM and ML were 0·46, 0·53, 0·51 and 0·59, respectively.

scholarly journals RELATIONSHIP OF MILK PRODUCTIVITY OF COWS WITH LIVE WEIGHT AND AGE AT THE FIRST INSEMINATION

2017 ◽  
Vol 54 ◽  
pp. 45-50
Author(s):  
G. D. Ilyashenko
Keyword(s):  
Correlation Analysis ◽  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Milk Productivity ◽  
Fat Yield ◽  
The Difference ◽  
Dairy Breed ◽  
Intensive Growth

The efficiency of the use of cattle of one or another breed is determined both by the level of milk productivity and the ability of the cattle to reproduce. At the same time, the future reproductive capacity, milk yield and duration of economic use to a large extent depends on the live weight and age when heifers insemination. The purpose of research. Study the effect of live weight and age at the first insemination on the milk productivity cows of Ukrainian red dairy breed. Methods. The research was carried out in the breeding plant of the state enterprise "Elite" of the Kirovograd state agricultural research station of NAAS on 697 cows of Ukrainian red dairy breeds, which were found during 2004–2014. Milk productivity of cows and their live weight and age at the first insemination were investigated according to the materials of the primary zootechnical and pedigree records. The degree of connection of live weight and age at the first insemination with milk productivity was estimated by correlation analysis. One-factor dispersion analysis determined the level of influence of the age of the first insemination and live weight on the productivity of cows. The calculations were made using methods of mathematical statistics using the software package "STATISTICA-6.1". Results of research. By the analysis of milk production on experimental cows, determined, that its level depends on the live weight of animals at the first insemination. Therefore, cows with live weight at the first insemination was 420–439 kg, dominated by mercy unique live weight of 380 kg in the first lactation at 244 kg (6242 vs 5998 kg), td = 1,96 for the third – 1069 kg (7465 vs 6396 kg), td = 2,37 by best lactation 498 kg (7916 vs 7418 kg), td = 2,03, significance level for all lactation (P < 0,05). To the milk fat, accordingly, the predominance was 13.2 kg (260,2 vs 247,0 kg), 22,9 (309,5 vs 286,6 kg) and 21,0 kg (325,1 vs 304,1 kg), the difference is close to the true values. The peers with a live weight of 400–419 kg and 440 kg and more also yielded in the first milk yield. The difference the milk I, III and the best lactation was 72 kg, 219 kg and 91 161 kg, 674, 589 kg for milk fat yield 5 kg, 10.3, 6.1 kg and 11.5 kg, 28.8, 19.5 kg, respectively. Due to the lesser number of animals, the vast majority of values did not reach a reliable level. Studies of milk productivity of cows, depending on the age of the first insemination, showed that its cow was the highest, which were counted at the age of 455 days. The lowest rates of dairy productivity were the animals that were fertilized at the age of 606 or more days. Correlation analysis found the highly reliable of feedback age insemination of cows milk yield in the first three lactation (-0,25 ... -0,37). Similar patterns of feedback for somewhat lower correlation coefficients are noted with the release of milk fat (-0,23 ... -0,33). Coherence of live weight at the I insemination and follow-on milk production was significantly lower (compared with age insemination) in absolute value, for only a certain level of first lactation milk yield and milk fat yield (P < 0,05). The significant influence of the investigated factors on milk yield of cows is established. Thus, by milk yield and milk fat and protein for 305 days of lactation cows power of influence age of first insemination exceeded 50%, the fat and protein in milk index of potency is 32 and 30% by high-confidence values for milk yield and yield of milk protein and fat . Somewhat lower than 20 to 33%, the effect of live weight on the first insemination was shown on the performance of cows. Сonclusion. The heifers of the Ukrainian Red dairy breed in conditions of the Central region of Ukraine advisable to fertilize at the age of 455 days, or 14,5–15 months, when they reach the living weight of 420–439 kg. The revealed feedback of the inseminative age and milk productivity can be explained by more intensive growth, better development and economic rapidity of the previously diced heifers and its should lead to intensive rearing of young animals. Determined, that the force of age-old influence of the first insemination on the lactic productivity of the cows exceeds 50%, the live weight reaches from 20 to 33%. Discovered tendency also confirms the expediency of intensive growth of repair heifers.

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