Non-linear modelling to describe lactation curve in Gir crossbred cows [PDF]
Journal of Animal Science and Technology, 2017 Background The modelling of lactation curve provides guidelines in formulating farm managerial practices in dairy cows. The aim of the present study was to determine the suitable non-linear model which most accurately fitted to lactation curves of five ...
Yogesh C. Bangar, Med Ram Verma
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Effects of season and age at first calving on genetic and phenotypic characteristics of lactation curve parameters in Holstein cows [PDF]
Journal of Animal Science and Technology, 2016 In this research data representing 72,946 primiparous cows from 724 herds with 638,063 total test day records calved between 2001 and 2011. These data were analysed to determine the effect of age at first and season of calving on parameters of the Wood ...
Mahdi Elahi Torshizi
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Association between age at first calving and lactation performance, lactation curve, calving interval, calf birth weight, and dystocia in Holstein dairy cows. [PDF]
PLoS ONE, 2021 In the present study, records on 115,291 heifers distributed in 113 herds were used to investigate the association between age at the first calving (AFC) and lactation performance, lactation curve, the length of the first calving interval (CI), calf ...
Hadi Atashi, Anise Asaadi, Miel Hostens
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Quantifying inter-group variability in lactation curve shape and magnitude with the MilkBot® lactation model [PDF]
PeerJ, 2013 Genetic selection programs have driven development of most lactation models, to estimate the magnitude of animals’ productive capacity from sampled milk production data.
James L. Ehrlich
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Analysis of genetic correlations between multivariate measures of lactation persistency and somatic cell score in Italian Simmental cattle [PDF]
, 2007 Genetic relationships between lactation curve traits and Somatic Cell Count are of great interest for dairy cattle breeding. Factor Analysis (MFA) and Principal Component Analysis (PCA) can be used to extract from the correlation matrix of milk test ...
Cappio Borlino, Aldo +3 more
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Fitting lactation curves in a Colombian Holstein herd using nonlinear models
Revista Facultad Nacional de Agronomía Medellín, 2018 Statistical characterization of dairy cows lactation curves allows prediction of total milk yield from one or a few test-day records. The objectives were the characterization of milk production in a Colombian Holstein herd under tropical dairy production
Norma Patricia Duque López +4 more
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Lactation Curves for First Lactation Egyptian Buffalo
Journal of Dairy Science, 1994 First lactation records of 1538 buffalo maintained at the Animal Production Research Institute farms in 1967 to 1990 were used to determine lactation curves for three lactation lengths: > 28 and < 150 d, > 149 d, and > or = 308 d, as well as all records. Daily milk yields were summed by 14-d intervals for analyses.
G H, Metry +3 more
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Fitting lactation curves of dairy cattle in different types of herds in Tunisia [PDF]
, 2003 peer reviewedThe incomplete gamma function was used to fit lactation curves of Holstein-Friesian cows in four types of herds in Tunisia. A total of 8640 records were used in the analysis.
Ben Gara, Abderrahmen +3 more
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Indian Journal of Animal Sciences, 2020 The effect of measure number of milk production (MP) on the estimation of parameters in typical and extended lactations curve parameters of local goats was evaluated.
GLAFIRO TORRES-HERNÁNDEZ +6 more
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Genetic Aspects of Lactation Curves
Journal of Dairy Science, 1981 Parameters of lactation curves were defined by a gamma-type function for 113,705 lactations from the California Dairy Herd Improvement Association. Heritabilities and genetic correlations were estimated from a mixed-model analysis of paternal half sisters for first, second, third, and later lactations.
R D, Shanks +3 more
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