Results 11 to 20 of about 14,782,076 (302)

PHENOTYPIC AND GENETIC CORRELATIONS BETWEEN FIRST LACTATION MILK YIELD AND SOME PERFORMANCE TRAITS IN SAHIWAL CATTLE [PDF]

Pakistan Veterinary Journal, 2004
Data on 8948 pedigree, breeding and performance records of a purebred herd of Sahiwal cattle maintained at the Livestock Experiment Station Jahangirabad district Khanewal (Pakistan) during the period 1939-98 were analysed.
K. Javed, M. Abdullah1 , M. Akhtar2 and M. Afzal3
doaj   +2 more sources

Integrated Single-Nucleus Multi-Omics Atlases Reveal Lineage Plasticity and Regulatory Networks of Luminal Epithelial Cells During Mammary Gland Lactation and Involution. [PDF]

Adv Sci (Weinh)
This study integrates single‐cell multi‐omics, spatial transcriptomics, and cross‐species comparative analyses to systematically characterize the cellular composition and differentiation trajectories of goat mammary epithelial cells, along with the gene regulatory networks and intercellular communication mechanisms governing these trajectories, thereby
Yan X, Mi X, Tan G, Li X, Zhu Z, Wei Z, Fan H, Wu Y, Shi T, Fang L, Gao Y, Wang Y, Liu J.   +12 more
europepmc   +2 more sources

Age and Herd Adjustment of First Lactation Milk Yield

Journal of Dairy Science, 1972
Abstract A new procedure for age and herd adjustment for first lactation milk yield was developed and evaluated with Canadian Holstein Record of Performance records. Multiple regression prediction equations from 2 years’ data considered the average yield and age of contemporaries in second and later lactations as well as effects of age at first ...
A.J. Lee, C.G. Hickman
openaire   +1 more source

Genetic Improvement of Total Milk Yield and Total Lactation Persistency of the First Three Lactations in Dairy Cattle [PDF]

Journal of Dairy Science, 2008
The objective of this study was to compare 6 selection criteria in terms of 3-parity total milk yield and 9 selection criteria in terms of total net merit (H) comprising 3-parity total milk yield and total lactation persistency. The 6 selection criteria compared were as follows: first-parity milk estimated breeding value (EBV; M1), first 2-parity milk ...
K, Togashi, C Y, Lin
openaire   +2 more sources

Associations between preweaning calf feeding behaviors with age at first calving and lactational performance using an automatic calf feeder

JDS Communications, 2023
The objective of this retrospective observational study was to determine whether preweaning calf behaviors and milk replacer (MR) intake from an automatic calf feeder were associated with age at first calving and first-lactation performance.
T.H. Swartz, C.S. Petersson-Wolfe
doaj   +1 more source

Prediction of first lactation 305-days lactation milk yield from peak yield and test day milk yields in crossbred cattle

The Indian Journal of Animal Sciences, 2019
Lactation yield (LY) of dairy animals have high relationship with peak yield and test day milk yield. The present study was carried out for prediction of 305 days lactation yield based on peak yield and test day milk yield. Data on 384 first lactation test day milk yield records of crossbred cattle maintained at GADVASU dairy farm over a period of 25 ...
NISHA SHARMA, RAMAN NARANG, POONAM RATWAN, NEERAJ KASHYAP, SONI KUMARI, SIMARJEET KAUR, VARINDER RAINA   +6 more
openaire   +1 more source

Evaluation of reference lactation length in Chios dairy sheep

Animal, 2019
Definition and establishment of a fixed reference lactation length could provide useful tools for on-farm comparison of ewes and flock management as well as genetic evaluations for the breeding programme. The objectives of this study were to (i) evaluate
Z. Basdagianni, E. Sinapis, G. Banos
doaj   +1 more source

Correlations Among First and Second Lactation Milk Yield and Calving Interval

Journal of Dairy Science, 1989
Estimates of genetic correlations were .17 between first lactation milk yield and concurrent calving interval, .10 between second lactation milk yield and first calving interval, and .82 between first and second milk yields. Corresponding phenotypic correlations were .27, .16, and .58.
Dong, M. C., Van Vleck, L. Dale
openaire   +2 more sources

Phenotypic effects of calving ease on the subsequent fertility and milk production of dam and calf in UK Holstein-Friesian heifers [PDF]

, 2011
The effect of calving ease on the fertility and production performance of both dam and calf was studied in approximately 50,000 and 10,000 UK Holstein-Friesian heifers and heifer calves, respectively. The first objective of this study was to estimate the
Coffey, M.P., Mrode, R; id_orcid, S.A.E. Eaglen, J.A. Woolliams, R. Mrode, Mrode, R., Wall, E; id_orcid, Wall, E., Woolliams, JA, Woolliams, J.A., Coffey, MP, E. Wall, Eaglen, SAE, M.P. Coffey, Eaglen, Sophie   +14 more
core   +1 more source

Accuracy of predicting milk yield from alternative milk recording schemes [PDF]

, 2005
peer-reviewedThe effect of reducing the frequency of official milk recording and the number of recorded samples per test-day on the accuracy of predicting daily yield and cumulative 305-day yield was investigated.
Cromie, A. R., Veerkamp, Roel F., P. Dillon, D. P. Berry, A. R. Cromie, Rath, M., Dillon, Pat, Berry, D.P., M. Rath, Olori, V. E., Rath, Myles V, Dilon, P., Olori, V.E., V. E. Olori, Veerkamp, R.F., R. F. Veerkamp, Cromie, A.R., Berry, Donagh   +17 more
core   +1 more source