Results 21 to 30 of about 8,210 (222)
Relationship between primiparas first 100-days lactation and their lifetime milk production in Polish Holstein-Friesian Cattle [PDF]
Journal of Central European Agriculture, 2015 The aim of this study was to identify the relationship between the lifetime performance of cows and their performance during the first 100 days of lactation.
Beata SITKOWSKA +3 more
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Veterinary Medicine and Science, 2023 Background Breeding objectives are designed to achieve targeted dairy cow production goals, which can be affected by production type, farmer preferences, environmental factors and genetic factors individually or in combination.
Yakob Asfaw, Regasa Begna, Worku Masho
doaj +1 more source
Relationship between Growth Pattern, Age at First Calving and Next Reproduction in Holstein Heifers
Journal of Animal Reproduction and Biotechnology, 2015 Growth rate during rearing, which varies depending on provided nutrition, has been related with age at 1st calving (AFC). This study investigated the effect of upgrowth parameters during the rearing period on the reproduction of nulliparous Holstein ...
Hyun-Joo Lim, Ho-Beak Yoon, Seok-Ki Im
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Heritability of Age at First Calving
Journal of Dairy Science, 1980 Abstract High heritabilities of age at first calving reported by a number of researchers may be due to confounding of service sires and time heifers were bred. Heritabilities from paternal half-sister analyses of variance models which included the effects of period of birth were less than from models where these were not included. Heritabilities were
F.R. Allaire, C.Y. Lin
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Relationship of dairy heifer reproduction with survival to first calving, milk yield and culling risk in the first lactation [PDF]
Asian-Australasian Journal of Animal Sciences, 2020 Objective The aim of our study was to determine the associations of heifer reproductive performance with survival up to the first calving, first-lactation milk yield, and the probability of being culled within 50 days after first calving.
István Fodor +2 more
doaj +1 more source
First-calving age and first-lactation milk production on Dutch dairy farms [PDF]
Journal of Dairy Science, 2013 Farmers attempting to reduce first-calving age (FCA) need to understand which rearing management factors influence FCA and first-lactation milk production (FLP). Reduced FCA might be associated with lower FLP. This study describes the association between herd FCA, FLP, and several herd-level health and rearing management variables and describes the ...
Mohd Nor, N. +4 more
openaire +3 more sources
Italian Journal of Animal Science, 2010 A total of 1551 normal lactation records of Egyptian buffaloes, Kept at Mehallet Mousa Farm, belonging to Ministry of Agriculture, during the period from 1960 to 2001 were used.
A.M. Kawthar, A.S. Khattab
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Analysis of non-genetic factors affecting calving difficulty in the Czech Holstein population
Czech Journal of Animal Science, 2008 The objective of this study was to analyze the effects of non-genetic factors affecting calving difficulty in the Holstein population of the Czech Republic for subsequent compilation of the model for genetic evaluation as well as for herd management ...
M. Fiedlerová +7 more
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EXTERNAL INDICATION AGE MODELS FOR FIRST CALVING
The Scientific and Technical Bulletin of the Institute of Animal Science NAAS of Ukraine, 2022 The results of predicting the age of the first calving using multiple regression analysis, based on exterior measurements and body structure indices of heifers, determined twice - at the age of about 100 days and about a year are shown. The models are designed using both linear and nonlinear components.
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Journal of the Indonesian Tropical Animal Agriculture, 2014 The aim of this study was to evaluate genetic analysis including heritability and further phenotypicand genetic trends of reproductive traits in Bali cattle.
A. Gunawan, R. Sari, Y. Parwoto
doaj +1 more source