ACCURACY OF MILK YIELD ESTIMATION IN DAIRY CATTLE FROM MONTHLY RECORD BY REGRESSION METHOD [PDF]
, 2009 This experiment was conducted to estimate the actual milk yield and to compare the estimation accuracy of cumulative monthly record to actual milk yield by regression method.
Johari, S +3 more
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Revista Colombiana de Ciencias Pecuarias, 2019 Background: Lactation persistency influences cow health and reproduction and has an impact on the feed costs of dairy farms. Objective: To estimate (co)variance components and genetic parameters of 100- and 305-d milk yield, and lactation persistency in ...
Farzane Shokri-Sangari +3 more
doaj +1 more source
Weight and Age at Calving and Weight Change Related to First Lactation Milk Yield
Journal of Dairy Science, 1983 Daily milk yields from 400 first lactations collected from one herd over 16 yr were utilized to ascertain relations of weight and age at calving and change of body weight during first lactation on milk yield and calving interval. These relationships were evaluated for the complete lactation and for each of five 60-day segments of the lactation.
L J, Fisher, J W, Hall, S E, Jones
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PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF FRIESIAN CATTLE UNDER ASSIUT ENVIRONMENTAL CONDITIONS [PDF]
Assiut Veterinary Medical Journal, 2018 Environmental factors such as animal origin, parity, year of calving and season of calving affect productivity. This work focused on the study of the effect of these factors on milk yield and reproductive traits of Friesian cows raised under Upper Egypt ...
HASSAN A.H +3 more
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Effect of season and temperature before and after calving on the future milk production of born heifers [PDF]
Acta Fytotechnica et Zootechnica, 2020 The aim of the study was to evaluate the effect of birth season, average maximum temperatures 6 weeks before and after birth of heifers on their first lactation milk yield.
Šimon Mikláš
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Rearing conditions and lifetime milk revenues in Swedish dairy cows [PDF]
, 2011 Associations between replacement heifer rearing conditions and lifetime milk revenues were studied throughout the productive life of Swedish dairy cows.
Svensson, Catarina, +8 more
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Effect of suckler cow genotype on milk yield and pre-weaning calf performance [PDF]
, 2005 peer-reviewedMilk yield and pre-weaning calf performance of spring-calving Charolais (C) and Beef × Holstein-Friesian (BF) cows was compared over 3 experiments.
Caffrey, Patrick J. +2 more
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Season of birth is associated with first-lactation milk yield in Holstein Friesian cattle
Animal, 2017 The aim of the present research was to assess factors associated with first-lactation milk yield in dairy heifers, including maternal and environmental factors, factors related to the development of the heifer and factors related to its offspring such as gender of the calf.
M. Van Eetvelde +3 more
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Merging and characterising phenotypic data on conventional and rare traits from dairy cattle experimental resources in three countries [PDF]
, 2012 peer-reviewedThis study set out to demonstrate the feasibility of merging data from different experimental resource dairy populations for joint genetic analyses.
Coffey, M.P. +15 more
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Genetic Parameters for First Lactation Milk Yields at Three Levels of Herd Production
Journal of Dairy Science, 1987 A multivariate linear model was used to estimate sire variance and covariance components and residual variance components for first lactation milk yield and logarithms of yield at three herd production levels using Restricted Maximum Likelihood with the Expectation-Maximization algorithm.
De Veer, J. C., Van Vleck, L. Dale
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