scholarly journals Application of correlation and regression analysis in the selection of black-and-white cows

2021 ◽  
Vol 282 ◽  
pp. 07020
Author(s):  
I.M. Donnik ◽  
O.S. Chechenikhina
Keyword(s):  
Regression Analysis ◽  
Milk Yield ◽  
Statistical Processing ◽  
Correlation Coefficients ◽  
Milk Composition ◽  
Black And White ◽  
Correlation And Regression Analysis ◽  
Daily Milk Yield ◽  
Selection Of ◽  
Daily Milk

The use of the method of correlation-regression analysis as the most widespread method of statistical processing of experimental data makes it possible to organize the selection of animals according to the leading characteristics of productivity. A positive and high correlation was established between milk yield and milk yield in all groups of studied animals (r = from 0.64 to 0.90), and between milk yield in 305 days of lactation and the highest daily milk yield - only in groups of Reflection Sovering and Montvik Chieftain cows. (r = 0.65 to 0.92). Cows of the Vis Back Aydial line have higher correlation coefficients between indicators of milk composition (r = from 0.72 to 0.91, depending on the trait). The calculation of the regression coefficients showed that in the studied groups of animals with an increase in the coefficient of constancy of lactation, the coefficient of milk production and the indicator of the highest daily milk yield per unit, the amount of milk for 305 days of lactation increased by an average of 1.63 - 221.04 kg.

scholarly journals Effect of season, genotype and lactation on milk yield and composition of local and crossbred dairy cows reared under different feed base region

2016 ◽  
Vol 19 (1-2) ◽  
pp. 50-65
Author(s):  
MA Baset ◽  
KS Huque ◽  
NR Sarker ◽  
MM Hossain ◽  
MN Islam
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Block Design ◽  
Milk Composition ◽  
Base Region ◽  
Total Solids ◽  
Randomized Block Design ◽  
Daily Milk Yield ◽  
Daily Milk

A total of 160 cows, 10 cows in each of native (local cow) and crossbred (local × Holstein Friesian) origins differing in lactation were used in 2×2×2×2 factorial experiment using Randomized Block Design (RBD) to evaluate milk yield and composition of cows considering regions (good & poor feed base region), seasons (dry: Nov.–Feb. 2009 & wet: Jun.–Oct. 2009), genotypes and lactation. A “good and/or poor feed base” region was classified based on the availability of quantity and quality roughages throughout the year. The study revealed that the daily milk yield and 4% FCM of cows under good feed base condition were 6.76 and 6.49 kg, respectively and under poor feed base condition were 3.67 and 3.31 kg, respectively. Feed base region did not affect on milk fat and it was observed that the milk protein, lactose, solids-not-fat (SNF), minerals and total solids under good feed base condition were 37.9, 54.9, 100.9, 6.3 and 140.6 g/kg, respectively, whereas, under poor feed base condition the values were 36.3, 52.9, 98.0, 6.1 and 135.2 g/kg, respectively. Season did not affect milk yield and composition except minerals (6.5 g/kg vs. 5.9 g/kg). Genotypes significantly (p?0.01) influenced daily milk yield, the milk protein and minerals. Lactation did not affect milk yield and the milk protein, but influenced the fat, lactose, SNF, minerals and total solids. The interaction of feed base regions and seasons significantly (p?0.01) influenced milk yield and the milk fat and SNF. The milk protein and lactose was influenced by the interaction of feed bases region, seasons and lactation. Milk yield negatively correlated with fat per cent. The percentage of fat significantly (p?0.01) correlated with protein, lactose, SNF, and minerals %. The percentage protein correlated with lactose, SNF and minerals. Lactose % significantly (p?0.01) correlated with SNF%. It may be concluded that milk yield and composition depends on feed base region, genotype and lactation of cows. Season did not influence milk yield and the composition. Milk yield negatively correlated with the percentage of fat, protein, lactose, SNF and milk composition strongly correlated with each other.Bangladesh J. of Livestock Res. 19(1-2): 50-65, Jan-Dec 2012

Milk yield and milk composition from grazing primiparous non-dairy crossbred ewes

2006 ◽  
Vol 57 (4) ◽  
pp. 377 ◽  
Author(s):  
J. E. Morgan ◽  
N. M. Fogarty ◽  
S. Nielsen ◽  
A. R. Gilmour
Keyword(s):  
Weight Gain ◽  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Total Yield ◽  
Milk Composition ◽  
Ewe Lambs ◽  
Daily Milk Yield ◽  
Sire Breed ◽  
Daily Milk

Milk production and milk composition were studied in 520 primiparous Merino crossbred ewes that were the progeny of 30 sires from several maternal crossing breeds including Border Leicester, Coopworth, Finnsheep and East Friesian. The ewes were born in 3 years (1997, 1998, and 1999), with 3 sires used in every year to provide genetic links. The crossbred ewe lambs were randomly assigned to autumn or spring joining groups and mated to Poll Dorset rams to lamb at 12 or 19 months of age. Ewes were milked on 3 days during their first lactation at approximately 3, 4, and 12 weeks after lambing. On each milking day, each ewe was initially injected with oxytocin, milked out by machine, and then hand-stripped. This procedure was repeated approximately 4 h later, with the milk weight and time recorded to extrapolate to daily milk yield, and composition of the milk was determined. Daily milk yield was analysed using REML mixed models procedures and 3 measures of milk production were predicted: peak milk yield at 21 days of lactation, total milk yield from 21 to 90 days of lactation, and length of lactation (days for daily yield to decline to 600 g/day). Milk composition traits (%fat, %protein, %lactose) and proportion of machine milk yield were analysed with similar models. Sire breed, number of lambs born and suckled, season, and ewe weight gain from mid-pregnancy until lamb weaning were all significant (P < 0.01) for daily yield, which declined from 2.1 kg/day at 21 days to 0.7 kg/day at 90 days of lactation. The Finnsheep-cross ewes had lower peak milk yield (1.84 ± 0.08 v. 2.09–2.19 ± 0.1 kg/day) and lower total yield of lactation (21–90 days) than all the other breed-cross ewes (78 ± 3 v. 92–107 ± 5 kg). The East Friesian-cross ewes had significantly longer lactations (128.8 ± 10.9 days) than the Border Leicester (98.1 ± 4.4 days) and Coopworth (93.7 ± 4.2 days), with the Finnsheep-cross ewes the shortest (80.1 ± 3.1 days). The East Friesian-cross ewes had the greatest and the Finnsheep-cross ewes the least total yield of lactation (107 ± 5 and 78 ± 3 kg, respectively). There were significant differences in peak milk yield for ewes bearing and suckling single lambs, twin-born and single-raised lambs, and twin-born and raised lambs (1.86 ± 0.04, 2.03 ± 0.09, and 2.37 ± 0.07 kg/day, respectively). There was a significant decline in daily milk yield with increasing ewe weight gain from mid-pregnancy to lamb weaning (–18.1 ± 4.2 g/kg). All the components of milk composition changed from the peak of milk production at 3 weeks to the end of lactation. The East Friesian-cross ewes had significantly lower milk %fat (by approx. 1 percentage point) at both 21 days and 90 days of lactation than ewes by all other sire breeds. The 30 sire progeny mean deviations for daily milk yield ranged from –292 to +276 g/day, with considerable ranges between sires within the sire breeds. The implications for lamb production and breeding programs are discussed.

scholarly journals Productivity of fi rst-calf cows of different sire lines

2019 ◽  
Vol 49 (4) ◽  
pp. 58-64
Author(s):  
A. G. Kolchev
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Lactation Period ◽  
Milk Productivity ◽  
Black And White ◽  
Holstein Breed ◽  
White Breed ◽  
High Level ◽  
Daily Milk Yield ◽  
Daily Milk

The results of the study of milk productivity and lactation rates of fi rst-calf cows are presented. The research into fi rst-calf cows of black-andwhite Holstein breed, belonging to sire lines of Wis Ideal 1013415 and Refl ection Sovereign 198998 was conducted in 2018 in Novosibirsk region. The number of cows under study was 64, the period of the study covered 305 days of lactation. Monitoring of milk production, milk fl ow intensity, fat and protein content was carried out monthly. The research materials were analyzed for groups of cows depending on their sire line and productivity for single and daily milk yield, fat and protein content, and dynamics of milk ejection for the fi rst 3 minutes of milking. The highest daily milk yield in both lines was observed in the second month of lactation. In the fourth and fi fth months of lactation, the average daily milk yield of Refl ection Sovereign cows was signifi cantly higher (р < 0.001) than that of their peers of the Vis Ideal line, by 1.3 kg. During the lactation period, the productivity of the Vis Ideal and Refl ection Sovereign cows was almost the same: milk yield – 8296 and 8220 kg, fat content – 4.02 and 4.06%, protein – 3.36 and 3.35% and milk fl ow intensity – 2.70 and 2.78 kg/min, respectively. In the second and third months of lactation, cows of both lines had a decrease in the content of fat, protein and intensity of milk fl ow with a gradual increase in these indices in the fourth and fi fth months of lactation. First-calf cows of the black-and-white breed of Canadian selection of different sire lines showed a high level of milk productivity and proved to be suitable for further breeding work.

scholarly journals The Effect of Sex Chromatin on Some Reproductive Traits of local Sheep in Erbil

2015 ◽  
Vol 9 (2) ◽  
pp. 6-10
Author(s):  
Nihad Ahmad Ameen Ameen ◽  
Salim Omar Raoof Raoof
Keyword(s):  
Correlation Coefficient ◽  
Milk Yield ◽  
Correlation Coefficients ◽  
Reproductive Traits ◽  
High Rate ◽  
Sex Chromatin ◽  
Positive Correlation Coefficient ◽  
Daily Milk Yield ◽  
Coefficient Of Regression ◽  
Daily Milk

This study was conducted on local sheep belongs to private flock in Erbil plain during the period 4/11/2011 till 25/10/2012. The investigation included 65 local sheep to study the effect of sex chromatinfrequency on the Daily Milk Yield (DMY), weight and age of ewes in addition the calculation ofRegression and Correlation coefficients between the studied traits of local sheep. The overall means offrequency of sex chromatin (drum stick, Appenx without stick, tear drop and small club). Appearedwith normal Neutrophils were 1.897, 1.034, 1.241, 0.741 and 95.86% respectively. The overall means ofDMY was 533.6g. The results showed that there was significant (P≤0.05) in relationship to DMY, thehighest rate of DMY was shown among the sheep had sex chromatin drum stick (675. 5g), while the rateof DMY was at lowest production among the sheep which had sex chromatin of small club (425.4g). Asignificant effect of weights and age of sheep on the patterns of sex chromatin were observed. Thehighest rate of DMY among the sheep was at the age of 4 years raised high rate of sex chromatin type(drum stick). A significant(P≤0.05) positive Correlation coefficient between DMY and sex chromatintype (drum stick) with value of 0.673, while there was a negative and significant (P≤0.05). Regressioncoefficient of DMY on sex chromatin coefficient (small club ) with coefficient of Regression value (-0.074). In addition the highest value of Correlation between the DMY and sex chromatin of (drum stick)was (0.856), followed with Correlation coefficient value between type of birth and weights of ewes(0.784), while the lowest Correlation value was (-0.087) between DMY and sex chromatin of (small club).

Genetic analysis of milk production and composition in crossbred ewes from different maternal genotypes

2009 ◽  
Vol 49 (1) ◽  
pp. 24 ◽  
Author(s):  
R. A. Afolayan ◽  
N. M. Fogarty ◽  
J. E. Morgan ◽  
G. M. Gaunt ◽  
L. J. Cummins ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Genetic Correlations ◽  
Milk Composition ◽  
The Other ◽  
Separate Analysis ◽  
Daily Milk Yield ◽  
Sire Breed ◽  
Daily Milk

Milk production and milk composition were measured in 1056 crossbred ewes managed under pasture grazing in a lamb production system. Most ewes were milked on three occasions at ~3, 4 and 12 weeks of lactation. The ewes were the progeny of mainly Merino dams and 91 sires from several maternal crossing breeds including Border Leicester, East Friesian, Finnsheep and Coopworth. The ewes were born over 3 years and run at three sites where they were joined naturally to meat rams. Most of the ewes were first parity (autumn-joined at 7 months of age and spring-joined at 14–17 months of age), with the remainder second or third parity. The cohorts of ewes and sites were linked genetically by three common maternal sires. The 4-h oxytocin-induced milking procedure was used to estimate daily milk production and milk samples were analysed for composition (fat%, protein% and lactose%). Daily milk yield and milk composition traits were analysed using restricted maximum likelihood mixed models procedures. The sire breed of crossbred ewes was significant for milk yield (P < 0.01), fat% (P < 0.01) and lactose% (P < 0.05). There was a significant (P < 0.01) interaction of sire breed × days of lactation, mainly due to the relatively higher milk yield of the East Friesian and White Suffolk cross ewes compared with the other crosses, at the end of the lactation. The East Friesian cross ewes had lower milk fat% than the other cross ewes. Ewes suckling multiple lambs had 29% higher peak milk yield than those bearing and suckling single lambs (P < 0.001). There was an increase in peak milk yield of the ewes from first to second parity, and third parity ewes had a greater decline to the end of lactation causing a significant interaction (P < 0.001). The overall decline in milk yield from peak to late lactation was –21.2 ± 0.7 g/day. Separate analysis showed a significant increase in milk yield with ewe pre-joining weight (regression 6.1 ± 1.8 g/day.kg). The estimate of heritability for daily milk yield was 0.24 ± 0.04 at 90 days of lactation and 0.10 ± 0.02 at 21 days of lactation. The estimates of heritability for the milk composition traits were generally moderate. Estimates of genetic correlations between measurements early and late in the lactation for milk yield and most composition traits were high. The within ewe by stage variance component estimates of repeatability were moderate to high for milk yield, fat% and protein%, with lactose% being low.

scholarly journals The effect of spring shearing on milk yield and milk composition in Tsigai ewes

2011 ◽  
Vol 27 (2) ◽  
pp. 241-249
Author(s):  
Y. Aleksiev
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Milk Composition ◽  
Daily Output ◽  
Lactose Concentration ◽  
Nutrient Partitioning ◽  
The Mean ◽  
Daily Milk Yield ◽  
Daily Milk

Milk yield and milk composition responses to shearing were assessed in Tsigai ewes kept indoors. Sheep was offered 700g/head daily concentrate and chopped hay administered ad libitum and was milked twice daily - at 08:00 and at 18:00 h. Average for the two weeks post-shearing, daily milk yield dropped by 7.2 % due to the 8.2 and 2.2 %, respectively, reduction in the morning and in the afternoon milk yields. Fat and protein concentrations in the morning and in the afternoon milk on day 1, day 7 and day 14 after shearing surpassed vastly pre-shearing values whilst milk lactose concentration showed a trend towards postshearing reduction. On the three sampling post-shearing days daily output of different milk constituents exceeded the corresponding mean pre-shearing values by 16.2, 11.6 and 9.1 % in milk fat, 1.6, 3.5 and 6.2 % in milk protein, and 4.1, 7.2 and 2.2 % in total solids. The increase in daily output of milk constituents occurred despite the decline in daily milk yield. Lactose daily output, on the contrary, dropped by 6.9, 7.7 and 9.3 % relative to the mean pre- shearing value. Postshearing adaptive adjustments including changes in nutrient partitioning appear to underlie the alterations in milk yield and milk composition. It may be concluded that post-shearing changes in milk composition makes for the improvement of milk processing characteristics.

scholarly journals EFFECT OF FEEDING OAK (Quercus aegilops) ACORNS ON MILK PRODUCTION, MILK COMPOSITION AND SOME BLOOD BIOCHEMICAL PARAMETERS OF BLACK GOATS

2021 ◽  
Vol 52 (1) ◽  
pp. 28-35
Author(s):  
Hoger M. Hidayet ◽  
Kamal N. Mustafa
Keyword(s):  
Milk Yield ◽  
Milk Protein ◽  
Control Diet ◽  
Milk Composition ◽  
Serum Glucose ◽  
Blood Biochemical ◽  
Milk Protein Content ◽  
Serum Biochemical ◽  
Daily Milk Yield ◽  
Daily Milk

 Twenty four Black goat does at 1st week post kidding were adapted to control diet for 2 weeks and then blocked into 4 groups (6 does/group) to be fed on one of the experimental diets (0, 5, 10 and 15% oak acorns) to study the effect of different levels of oak acorns on milk yield, milk composition and some serum biochemical traits. Results revealed that at 10th week of lactation, there was a significant increase in daily milk yield in does fed on 15% oak acorns. In contrast the group fed on 15% oak acorns exhibited a significant decrease in milk protein and solid non-fat contents at 10th week of lactation. The milk lactose yield was significantly higher in group fed on 15% oak acorns at 10th week of lactation. The serum glucose concentration at 8th week of lactation was significantly higher in does fed on 10% oak acorns while at 10th week; it was significantly higher in does fed 5% oak acorns. It could be concluded that feeding does on diets containing 15% oak acorns caused a significant increase in daily milk yield of Black goats and a significant decrease in milk protein content.

scholarly journals The reaction of the thyroid gland to the thyrotropic hormone “load” in high and low-yielding cows

2021 ◽  
Vol 282 ◽  
pp. 04002
Author(s):  
V.I. Eremenko ◽  
G.A. Gorozhankina ◽  
N.V. Vanina ◽  
S.I. Shuklin ◽  
A.I. Blednov
Keyword(s):  
Thyroid Gland ◽  
Thyroid Hormones ◽  
Milk Yield ◽  
Live Weight ◽  
Thyrotropic Hormone ◽  
Black And White ◽  
Functional Reserves ◽  
White Breed ◽  
Daily Milk Yield ◽  
Daily Milk

The studies were carried out on cows of Holstein black-and-white breed. 2 groups of 10 heads each were formed. The milk yield for lactation was 10 thousand kg in the first group, and - 5 thousand kg in the second group. Blood was collected from the subcaudal vein monthly during lactation. T3 and T4 were determined in the blood serum. The functional “load” on the thyroid gland was performed at the peak of lactation (3 months) and at its end - at 9 months. The TSH preparation at a dose of 0.5 u/kg of live weight was administered intramuscularly on an empty stomach before morning feeding. T3 and T4 hormones in the blood were determined before the injection of TSH and 0.5 one and two hours after the injection. Kath was calculated using the formula Т1 – Т0 / Т0 where Kath is the coefficient of activity of thyroid hormones. T0 – T3 and T4 levels before TSH injection T1 – T3 and T4 levels 2 hours after TSH injection. During lactation, the level of milk production and thyroid hormones varies inversely with the average daily milk yield. During the period of high milk productivity (2,3,4 months of lactation), the concentration of T3 and T4 in both groups was low, and later increased and was maximum in the 8th month of lactation. The functional reserves of the thyroid gland in high-yielding cows in 3 and 9 months of lactation are lower in relation to low-yielding cows.

scholarly journals Prediction of test day milk yield by ac method in indigenous Balkan goats in Macedonia

2017 ◽  
Vol 33 (3) ◽  
pp. 299-308 ◽  
Author(s):  
Nikola Pacinovski ◽  
Vladimir Dzabirski ◽  
Georgi Dimov ◽  
Koco Porcu ◽  
Elena Eftimova ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Accurate Result ◽  
Alternative Method ◽  
The Difference ◽  
Daily Milk Yield ◽  
Selection Of ◽  
Daily Milk

Accurate and precise milk recording is one of the most important moments for a successful selection of milking goats. In this context, breeders are constantly making efforts to find the most suitable and cheapest methods for conducting of tests for milk production. The goal of this research was to compare the A4 method (as referent method) with AC method (as alternative method), for determination of milk production, on the day of recording of the indigenous Balkan goat, in the period of 2014-2016 with milking of goats in the morning and evening. It was determined that the difference between the predicted daily milk yield with one milking (in the morning or evening) and the measured milk yield using the A4 method is too low and almost negligible. With the analysis of all factors (year, lactation and number of milk tests), it was determined that the prediction of total daily milk yield, based on the evening milking, provides more accurate result, in relation to the prediction during morning milking, in cases when using the AC method.

Characteristics of population genetic and breeding parameters of the traits of milk productivity of black-and-white and Holstein cows of the Republic of Kazakhstan

2022 ◽  
pp. 48-58
Author(s):  
A. Kharzhau ◽  
A. Shamshidin ◽  
A. Sermyagin ◽  
K. Zhumanov
Keyword(s):  
Milk Yield ◽  
Population Genetic ◽  
Breeding Value ◽  
Holstein Cows ◽  
Milk Productivity ◽  
Breeding Parameters ◽  
Black And White ◽  
The Republic ◽  
Daily Milk Yield ◽  
Daily Milk

Purpose: determination of the selection and genetic parameters of the daily milk productivity of black-and-white and Holstein cows to characterize the population.Materials and methods. The studies were carried out using a database formed on the basis of the information and analytical management system of animal husbandry in the Republic of Kazakhstan (RK) for daily control milking of Holstein and black-and-white cows. The sample included indicators of milk productivity for three lactations of animals bred in 43 herds: I lactation - 14 482 records (3130 cows and 391 bull fathers), II lactation - 13 656 records (2734 cows and 537 bull fathers), III lactation - 4,911 records (886 cows and 260 bull fathers).Results. Phenotypic variability indices (CvP) by lactation varied: daily milk yield - 34.1 ... 38.8%, MJ - 9.8 ... 11.6%, BMD - 6.7 ... 8.6%, SCS - 32.5 ... 37.8%. The additive genetic variability (CvA) was lower and ranged for: daily milk yield - 22.9 ... 27.0%, MJ - 3.8 ... 4.7%, BMD - 2.6 ... 3.1%, SCS - 13 , 8 ... 14.7%. The heritability of indicators of milk productivity on average for three lactations was: in terms of milk yield - h2 = 0.440, percentage of fat - h2 = 0.155, percentage of protein - h2 = 0.121, SCS - h2 = 0.161. Evaluation of the dynamics of changes in daily milk yield and SCS showed the standard nature of the shape of lactation curves with the values ​​of the determination coefficient of the phenotypic trend equation, respectively, R2 = 69.9 ... 86.4% and R2 = 11.8 ... 20.5%. An increase in the number of recorded days of control milking from 1 to 10 increased the accuracy of the forecast of the breeding value (EBV) of animals for signs of milk production by 1.7-2.4 times. Evaluation of cows by their own productivity for milk yield with optimal values ​​of forecast reliability over 70% can be carried out on the basis of 4 control milking units. At the same time, for the percentage of fat and protein, SCS, the number of observations to achieve reliable EBV results ranged from 8 to 10. Based on the average values ​​of the breeding value of cows, the population genetic characteristics of the farmed cattle in the Republic of Kazakhstan were determined in the context of breeds, country and region (population) origin. Holstein animals (+54.3 kg of milk) were characterized by the highest EBV values. Among imported cows, the best breeding value forecast was obtained for cows imported from Germany (+63.3 kg of milk). For the Kazakh population of cattle, leading positions in terms of genetic prognosis were achieved in East Kazakhstan region (KZF, +334.4 kg of milk). A principal component analysis based on an assessment of the breeding value of cows showed clear differentiation by breed level, country and region of origin of the livestock. The most significant differences were found for animals originated in the Kostanay region (KZP).Conclusion. Analysis of the results of population-genetic and breeding parameters of the characteristics of milk productivity of black-and-white and Holstein cattle showed that there are necessary prerequisites for the development of their own breeding base, increasing the efficiency of selection of animals for breeding groups.

Sign in / Sign up

Export Citation Format

Share Document