Reproductive rates and milk yield of Kenana cattle in Sudan

1960 ◽  
Vol 55 (2) ◽  
pp. 183-188 ◽  
Author(s):  
K. A. Alim
Keyword(s):  
Milk Yield ◽  
Average Length ◽  
Dairy Herd ◽  
Lactation Length ◽  
Coefficients Of Variation ◽  
Rate Of Increase ◽  
Close Relationship ◽  
The Mean ◽  
Reproductive Rates ◽  
Calving Intervals

An analysis has been made of the reproductive rates and milk yield of Kenana cattle in a closed dairy herd in Sudan.The average age at first calving was 38·4 months and calvings were most frequent between September and December.The average length of productive herd life of cows was 5·42 lactations.The average interval between successive calvings was 395 days, and this was influenced by years and age.The mean generation interval was 6·72 years.The average milk yield in 224 days was 338 gal. with a standard deviation of 152 gal.There was a close relationship between milk yield and lactation length; r = 0·866 ± 0·013.Milk yield increased by age until the fourth lactation when it was about 137% of the first lactation. The rate of increase in yield between first and second lactation was highest and amounted to 22%.Year of record had a pronounced effect on milk yield.Month of calving had a slight effect on milk yield.The repeatability estimates of single records milk yield, calving intervals, lactation periods and dry periods were 0·432 ± 0·046, 0·058 ± 0·059, 0·192 ± 0·058 and 0·069 ± 0·065, respectively.The increase in repeatability estimates between earlier and later successive milk yield records was accompanied by a decrease in the coefficients of variation of these records.The heritability of a single record milk yield was 0·239 ± 0·245.The rate of annual genetic superiority in milk yield of dams of cows and dams of bulls was found to be 0·74% of the herd average.

scholarly journals Lactation curve of Beetal goats in Pakistan

2013 ◽  
Vol 56 (1) ◽  
pp. 892-898
Author(s):  
A. Waheed ◽  
M. S. Khan
Keyword(s):  
Milk Yield ◽  
Model Parameters ◽  
Yield Data ◽  
Lactation Length ◽  
Lactation Curve ◽  
Rate Of Increase ◽  
The Mean ◽  
Rate Of Decline ◽  
Wood Model ◽  
Effect Of Age

Abstract. This study was accomplished with the objective to determine parameters of lactation curves in Beetal goats using Wood’s model. Therefore, milk yield data on 127 Beetal goats maintained at five different government farms were recorded from post-kidding to drying off of does. Wood model parameters were estimated using non-linear regression and individual curves were fitted. The characteristics/parameters of lactation curve were computed. The mean initial yield »a«, rate of increase »b« and rate of decline »c« parameters in Wood’s model for Beetal were 1,214.97, 0.3690 and 0.1196, respectively with R2 value of 98.2 %. The value of percent squared bias (PSB) and the persistency were 0.13 and 60.2%, respectively with mean square error value of 38.45. Flock effect was a significant (P<0.01) source of variation for all the lactation curve parameters, PSB and persistency. Parity did not affect significantly any of the parameters. Type of birth significantly influenced parameter »a«, Time to reach peak (TPY) and lactation milk yield (LMY). Sex of kid also did not affect significantly any of the parameters. Age of doe was significant for parameters »a«, »b«, »c«. Quadratic effect of age was non-significant for all parameters and characteristics. Lactation length significantly affected parameter »a«, »b« and LMY.

The influence of liveweight at calving on milk production in Friesian heifers

1965 ◽  
Vol 32 (2) ◽  
pp. 135-141 ◽  
Author(s):  
B. Ridler ◽  
W. H. Broster ◽  
D. R. Westgarth
Keyword(s):  
Milk Yield ◽  
Positive Relationship ◽  
Final Analysis ◽  
Regression Equations ◽  
Mean Values ◽  
Significant Positive Relationship ◽  
Lactation Length ◽  
Group A ◽  
The Mean ◽  
Maintenance Requirements

SummaryRecords of 81 heifers, daughters of 6 bulls, were examined to determine the regressions of milk yield, corrected for lactation length, on initial liveweight and age at calving.Age was found to have no significant effect and was discarded in the final analysis.The regression equations were similar for the different groups of half-sibs, except for one group whose members had not been fed according to milk yield. After removal of this group, a highly significant positive relationship between lactation yield and liveweight at calving was found ‘within bull groups’. The mean values of groups of halfsibs did not show this relationship, and significant differences in milk yield still persisted between groups after adjustment for liveweight differences.It was concluded that herd improvement by choosing heifers solely on the basis of liveweight shortly after calving appears unlikely to be effective unless the sire's potential is known and the feeding during lactation takes into account the greater maintenance requirements of heavier animals.

scholarly journals An Important Genotype for Sustainable Extensive Goat Production Systems of Turkey: The Gökçeada Goat

2021 ◽  
Vol 9 (8) ◽  
pp. 1460-1466
Author(s):  
Cemil Tölü ◽  
Türker Savaş
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Production Systems ◽  
Live Weight ◽  
Predominantly Black ◽  
Lactation Length ◽  
The Mean ◽  
Similar Body ◽  
Light Color ◽  
Intensive System

In this study, it was aimed to report some traits of Gökçeada goats, which raised under the natural conditions of Gökçeada, with respect to their protection within the scope of genetic resources. In this respect the information obtained from the goats supplied from the Island and reared in a semi-intensive system at Çanakkale Onsekiz Mart University and also the information obtained from the literature were collected and the biological and zootechnical identifications of the Gökçeada goat were performed. Gökçeada goats, which are predominantly black, have yellow or red blazes on both sides of their heads including their eyes. It was seen that Gökçeada goats had similar body measurements and lower live weights as compared to those of the same species on the mainland. The birth weight and the mature live weight of Gökçeada goats were found as 2.55 kg and 38 kg, respectively, whereas their mean kid yield per goat at birth was determined as 1.6 to 1.8 kids. Individuals with a milk yield of 591 kg were striking in the Gökçeada genotype, in which the mean lactation length and the mean lactation milk yield were determined as 251 to 259 days and 227 to 245 kg, respectively. Its milk fat (4.92-5.75%) and milk protein (3.29%) resembled those of our other native breeds. It is necessary to reveal, with more elaborate studies, the potential for Gökçeada goat cheese that is greatly demanded on the Island. It was determined that the Gökçeada kids, which were considered as dairy kids, had some small but nonfat carcass and that their meat was soft and of a light color and had a slight smell. One should be careful about the adaptation of the Gökçeada genotype, which successfully maintains itself under the island conditions and which is the source of income for producers, to intensive and extensive goat production systems.

scholarly journals APPLICATION OF THE DESIRED TYPE CONCEPT IN HERD OF JERSEY BREED

2020 ◽  
Vol 59 ◽  
pp. 41-50 ◽  
Author(s):  
O. А. Kochuk-Yashchenko ◽  
D. M. Kucher
Keyword(s):  
Milk Yield ◽  
High Performance ◽  
Physiological State ◽  
Dairy Herd ◽  
Average Value ◽  
Reproductive Ability ◽  
Automated Information System ◽  
The Mean ◽  
The Difference ◽  
High Level

The results of the studies highlight the usefulness of application of the concept of the desired type for herd of Jersey breed. The researches have conducted in the herd of the Jersey breed of «Dan-Milk» subsidiary of Chernyakhiv district of Zhytomyr region. Zootechnical and breeding records have been established at a high level. The implementation of various zootechnical and technological operations greatly facilitate by the introduction of the automated information system "Uniform Agri". The conditions for raising, feeding, keeping and using cows ensure the realization of their genetic potential for milk production. Milking of cows held on the "Parallel". Keeping cows unattached to rest boxes. The rations have made according to the physiological state and the level of productivity of the animals. The correspondence of the indices of first-calf cows of cognate groups, offspring of booger-breeders, differentiated groups by the value of the animals of the desired type was determined by the mean normalized deviation (t) in fractions of the mean square deviation (σ) according to the concept of the desired type by the method of M. Pelekhaty and L. Piddubna. The cows were characterized by 6 indicators of dairy productivity and 5 – reproductive ability of the first lactation. Improving the economically useful traits of cows to parameters of the desired type were carried out by using various breeding techniques. The offspring of bulls Headline 114114336 (t = -0.27) and DJ Jante 302761 (t = -0.30) had the best fit for the parameters of animals of the desired type according to the studied characteristics, the worst was Karl 67037285 (t = -0.77). As a result of researches it has been established that indices of cows of different cognate groups have characterized by less conformity to parameters of animals of the desired type, in comparison with the results of daughters of individual sires on the average value of normalized deviation. Cows of the Fallneva’s 593883 (+0.01) cognate group are closer in terms of reproducibility to animals of the desired type of cows, Surville’s 604694 (-0.06) are the least, and in the milk productivity, the Observer’s 553236 (-0.56) related group and Fallneva’s 593883 (-0.82), respectively. With the increase in the milk yield of Jersey cows, there was a decrease in the difference between the indices of animals of different groups with corresponding parameters of animals of the desired type. With the increase in the level of milking from 10 thousand. slightly better cows (t = +0.06) have observed for the parameters of the animals of the desired type, but this result is due to the very low reproductive ability of the cows and long lactation, which makes it impossible to repair the herd in time for its own young. In 36 cases out of the 55 cows with different levels of dairy productivity were significantly inferior to parameters of the animals of the desired type, accounting for 65.5% of the total number of comparisons. It is advisable to select animals with a milk yield of at least 9000 kg of milk, which will lead to an increase in the number of cows of the desired type in the herd. The most usefulness methods of creating a high-performance dairy herd for «Dan-Milk» subsidiary have been identified and presented. They identified the use of Jersey sires cows and the selection of cows by milk yield (the average normalized deviation on reproduction ability were -0.07 and -0.08, on the basis of dairy productivity -0.73 and -0.72).

scholarly journals Productive and reproductive performance of dairy cattle in Char areas of Bangladesh

1970 ◽  
Vol 25 (2) ◽  
pp. 68-74 ◽  
Author(s):  
MM Alam ◽  
MJU Sarder ◽  
Z Ferdousi ◽  
MM Rahman
Keyword(s):  
Reproductive Performance ◽  
Post Partum ◽  
Gestation Length ◽  
Production Traits ◽  
Lactation Length ◽  
The Mean ◽  
Daily Milk Yield ◽  
Calving Intervals ◽  
Better Than ◽  
Daily Milk

Production traits of 60 indigenous (Desi), 20 Friesian × Desi and 20 Sahiwal × Desi cows were recorded in six char villages of Sariakandi upazila (Sub-district) of Bogra district. The mean (± SD) daily milk yields were 1.7 ± 0.6, 6.3 ± 1.2 and 5.1 ± 1.0 litres, respectively. The lactation lengths, ages at puberty, gestation lengths, calving intervals, numbers of services per conception, intervals between calving and first oestrus were 217.9 ± 18.7, 253.8 ± 21.9, 240.8 ± 15.7 days; 27.4 ± 2.7, 23.9 ± 2.0, 26.2 ± 2.4 months; 277.4 ± 4.2, 278.3 ± 4.2, 278.3 ± 4.0 days; 494.8 ± 27.3, 487.5 ± 17.4, 493.3 ± 16.2 days; 1.3 ± 0.5, 1.7 ± 0.6, 1.6 ± 0.5; 145.6 ± 27.4, 166.8 ± 33.0 and 170.5 ± 34.9 days, respectively. Daily milk yield and lactation length were significantly (p<0.01) better for cross-bred cows than for Desi, and age at puberty was significantly (p<0.01) better for Friesian-cross cows than for Desi, while number of services per pregnancy and onset of post partum oestrus were significantly (p<0.01) better for Desi than for cross-bred cows. There were no significant differences in gestation length and calving interval. It is suggested that the overall productive and reproductive performance of Friesian × Desi and Sahiwal × Desi cows were better than those of Desi cows. DOI: 10.3329/bvet.v25i2.4620 Bangl. vet. 2008. Vol. 25, No. 2, 68-74

Chilika buffaloes in Orissa: a unique germplasm

2003 ◽  
Vol 33 ◽  
pp. 73-79 ◽  
Author(s):  
B.N. Patro ◽  
P.K. Mishra ◽  
P.K. Rao
Keyword(s):  
Salt Lake ◽  
Natural Ecosystem ◽  
Economic Traits ◽  
Rural People ◽  
Lactation Length ◽  
High Heritability ◽  
The Mean ◽  
Daily Milk Yield ◽  
Calving Intervals

SummaryPeople in the villages situated on the bank of the famous salt lake Chilika in Orissa rear buffaloes with almost zero input. These animals, endowed with the special quality of entering deep into the lake and feeding on the vegetation that grows there, help to maintain the natural ecosystem and provide good earnings for the rural people. This biodiversity in buffalo germplasm needs to be preserved. The mean body length, girth, height at withers and weight were 122.3±0.2 cm, 169.7±0.3 cm, 123.9±2.7 cm and 320.0±0.7 kg, respectively. The mean age at first calving was 1 331.4±6.8 days. The average of the first two calving intervals was 431.7±3.6 days. The average daily milk yield of the first three lactations and lactation length was 2.6±0.01 kg and 238.7±2.1 days, respectively. Most of the economic traits had high heritability. The temperature of the habitat ranges approximately between 15°C in winter to 40°C in summer.

Comparison of equations for predicting voluntary intake by dairy cows

1984 ◽  
Vol 103 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Heather D. St. C. Neal ◽  
C. Thomas ◽  
J. M. Cobby
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Live Weight ◽  
Dairy Herd ◽  
Experimental Period ◽  
Regression Equations ◽  
Voluntary Feed Intake ◽  
The Mean ◽  
Voluntary Intake ◽  
Grassland Research

SummaryRations for dairy cows are often formulated using predictions of voluntary feed intake calculated from regression equations. The accuracy of the predictions of dry-matter intake by seven equations is investigated. Comparisons are made when live weight is taken to be the observed weekly mean (MLW), the observed live weight after calving (CLW) or an estimated breed weight accompanied by a notional pattern of live-weight change (BLW). Data recorded on a British Friesian dairy herd at the Grassland Research Institute fed mostly silage ad libitum and various supplements are used. The mean square prediction error (MSPE) is calculated for each week and summarized over the whole experimental period.The least MSPE's are 2·1, 2·8 and 2·4 (kg D.M.)2 for comparisons using MLW, CLW and BLW respectively. The Ministry of Agriculture, Fisheries and Food (1975) equation involving only live weight and milk yield performs well and would be useful when only the limited measurements of live weight and milk yield are available, but the more complex equations of Vadiveloo & Holmes (1979) and of Lewis (1981) give consistently the best predictions. The importance of using the original definitions of the variables when applying a predictive equation is illustrated. Even so, the large errors found in the predictions of intake points to the need for further research.

A comparison of milk production traits in Friesian × White Fulani crossbred cattle

1981 ◽  
Vol 32 (2) ◽  
pp. 165-170 ◽  
Author(s):  
V. Buvanendran ◽  
M. B. Olayiwole ◽  
K. I. Piotrowska ◽  
B. A. Oyejola
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Production Traits ◽  
Genetic Contribution ◽  
Crossbred Cattle ◽  
Milk Production Traits ◽  
Lactation Length ◽  
Calf Mortality ◽  
White Fulani ◽  
Calving Intervals

ABSTRACTA study was made of the performance of different grades of Friesian × White Fulani crosses using 12 years' records from 1967 to 1978. Milk yield increased progressively with increases in the proportion of Friesian genes. Lactation length also showed a similar trend, with a difference between 1/2 and 7/8 grades of 41 days. Calving intervals averaged approximately 390 days and did not differ among grades. Calf mortality was high, varying from 16 to 29%. The optimal genetic contribution from the Friesian for this environment is considered to be higher than 75 %

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