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Abstract

Genotype by environment interaction (G × E) effects for lactating cows' fertility traits may differ with lactation number when accounting for herd production level. Our objective here was to investigate the genetic correlations among three fertility traits in cows and lactation persistency within...

Author(s)
Yamazaki, T.; Takeda, H.; Osawa, T.; Yamaguchi, S.; Hagiya, K.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Livestock Science, 2019, 219, pp 97-103
Abstract

In this study, we compared multiple logistic regression, a linear method, to naive Bayes and random forest, 2 nonlinear machine-learning methods. We used all 3 methods to predict individual survival to second lactation in dairy heifers. The data set used for prediction contained 6,847 heifers born...

Author(s)
Heide, E. M. M. van der; Veerkamp, R. F.; Pelt, M. L. van; Kamphuis, C.; Athanasiadis, I.; Ducro, B. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 10, pp 9409-9421
Abstract

Ketosis (KET) is one common metabolic disorder that occurs mainly in early lactation and affects the dairy industry with significant economic losses. Cows with ketosis have lower milk yield and reproductive performance and greater risk of other periparturient diseases. As a metabolic disease, the...

Author(s)
Huang, H.; Cao, J.; Hanif, Q.; Wang, Y.; Yu, Y.; Zhang, S.; Zhang, Y.
Publisher
Wiley, Oxford, UK
Citation
Animal Genetics, 2019, 50, 4, pp 376-380
Abstract

Lactation persistency (cow's ability to maintain milk production after reaching its peak) is a very important economic characteristic in the dairy cattle production system. Different definition and functions for describing and measuring of this trait were proposed by researchers. The random...

Author(s)
Torshizi, M. E.; Mashhadi, M. H.; Farhangfar, H.
Publisher
Indian Council of Agricultural Research, New Delhi, India
Citation
Indian Journal of Animal Sciences, 2019, 89, 6, pp 607-614
Abstract

This research paper addresses the hypothesis that in times of negative energy balance around parturition in dairy cattle, lipids stored in adipocytes are mobilised in a more intensive manner out of the abdominal depots than out of the subcutaneous adipose tissues. Furthermore, the impact of niacin...

Author(s)
Ruda, L.; Raschka, C.; Huber, K.; Tienken, R.; Meyer, U.; Dänicke, S.; Rehage, J.
Publisher
Cambridge University Press, Cambridge, UK
Citation
Journal of Dairy Research, 2019, 86, 3, pp 296-302
Abstract

Our objective was to combine the methods of geometric morphometrics and multivariate quantitative genetics to genetic evaluation of the size and shape of lactation curves of milk of 3,492 Israeli first-parity Holstein cattle. Lactation records were treated as morphological data, for which 2...

Author(s)
Durón-Benítez, A. A.; Weller, J. I.; Ezra, E.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 12, pp 11132-11142
Abstract

Bovine mammary gland involution, as a part of the reproductive cycle in dairy cows, is a very important remodeling transformation of the mammary gland for the subsequent lactation. There is considerable incentive to accelerate mammary gland involution to improve udder health, shorten the dry...

Author(s)
Zhao, X.; Ponchon, B.; Lanctôt, S.; Lacasse, P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 8, pp 6701-6717
Abstract

The objective was to estimate the genetic parameters for the cow's ability to stay in the herd (stayability) until 48 and 54 months of age (STAY48 and STAY54) and up to 36 and 48 months after the first calving (STAY36ac and STAY48ac), and their associations with 305-day milk production (MP305) in...

Author(s)
Rocha, G. M. F.; Cobuci, J. A.; Costa, C. N.; Abreu, L. R. A.; Mota, L. F. M.; Pires, A. V.; Villela, S. D. J.; Martins, P. G. M. A.
Publisher
CSIRO, Collingwood, Australia
Citation
Animal Production Science, 2018, 58, 10, pp 1788-1793
Abstract

The objective of this study was the estimation of genetic correlation (rg) for milk production traits across milking frequency (MF) in New Zealand dairy cattle milked once-(OAD) or twice-a-day (TAD). Analysis was made of lactation yields of milk, fat and protein, and somatic cell score of...

Author(s)
Lembeye, F.; López-Villalobos, N.; Burke, J. L.; Davis, S. R.
Publisher
Taylor & Francis, Melbourne, Australia
Citation
New Zealand Journal of Agricultural Research, 2018, 61, 1, pp 92-101
Abstract

It is of practical importance to ensure the data quality from a milk-recording system before use for genetic evaluation. A procedure was developed for detection of multivariate outliers based on an approximation for Mahalanobis distance and was implemented in the Nordic Holstein and Red population. ...

Author(s)
Gao, H.; Madsen, P.; Pösö, J.; Aamand, G. P.; Lidauer, M.; Jensen, J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 12, pp 11159-11164

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