Influence of breed,parity, and stage of lactation on lactational performance and relationship between body fatness and live weight |
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| Institution: | 1. Department of Animal Breeding and Genetics, Danish Institute of Agricultural Sciences, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark;2. Department of Animal Health and Welfare, Danish Institute of Agricultural Sciences, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark;1. Clinical Laboratory, Huzhou Central Hospital, Huzhou, Zhejiang, China;2. Clinical Laboratory, Zhuantang Community Healthcare Center of Xihu District, Hangzhou, Zhejiang, China;1. Service de psychiatrie du sujet âgé, CHRU de Brest, route de Ploudalmezeau, 29820 Bohars, France;2. CHU Paris Ouest Site Celton, AP–HP, 92133 Issy-Les-Moulineaux, France;4. CeReS, université de Limoges, Limoges, France;1. Department of Analytical Chemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan;2. Division of Pharmacy, Tama Hospital, 2082 Nakano-cho, Hachioji, Tokyo 192-0015, Japan |
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| Abstract: | The aim of this study was to characterise the effects of genotype, parity and nutrition on performance and the relationship between body condition and body weight. A total of 657 lactations from 322 cows were used. Three breeds were used, Danish Holstein, Danish Red and Jersey. Each breed was subdivided into two lines selected to differ in milk yield. Within line cows were randomly assigned to either a normal or low energy density total mixed ration. Three 1-week periods representing early lactation, peak milk yield and late lactation were identified for the analyses. For the analysis of the relationship between body weight and condition score, the dry period was also considered. There were significant effects of breed on all performance measures but no effect of line (with the exception of condition score). Cows fed the normal energy density diet had higher milk yield, fat percentage and condition score and weighed more than cows on the low feeding treatment. There was a highly significant relationship between body weight and condition score. In all periods except the dry period, there were significant effects of breed (P<0.001) and parity (P<0.05) on the intercept of the relation between body weight and condition score. However, there was no significant effect of breed or parity on the slope of the relationship between body weight and condition score. |
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