SHORT COMMUNICATION

Effects of N-Carbamylglutamate Supplementation on Milking Performance, Serum Biochemical and Immunity Parameters in Transition Cows

  • DONG Xusheng ,
  • LI Yuanjie ,
  • FA Wenjing ,
  • LIN Xueyan ,
  • HU Zhiyong
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  • 1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
    2. Taian Jinlan Dairy Farming Co., Ltd., Tai'an 271018, China

Received date: 2021-05-16

  Online published: 2021-12-16

Abstract

The aim of this study was to investigate the effects of N-carbamylglutamate (NCG) supplementation at different times of the transition period on milking performance, serum biochemical and immunity parameters in transition cows. Eighty Holstein transition cows with similar weight, parity, milk yield, and body condition scores were randomly divided into four groups of 20 cows each. Group A:NCG supplementation started from 21 d ante-partum to the day of calving; group B:NCG supplementation started from the day of calving to 21 d post-partum; group C:NCG supplementation started from 21 d ante-partum to 21 d post-partum; group D:control group, cows fed a basal diet during the whole transition period. The average supplementation dose of NCG was 20 g/d each cow. Blood samples were collected at 21 d ante-partum, the day of calving and 21 d post-partum to detect serum biochemical and immune parameters. Milk samples were collected from 19 to 21 d post-partum to detect milk composition. The results showed that feeding NCG before, after or throughout the transition period significantly increased fat-corrected milk yield and milk protein content compared with the control group (P<0.05), with postpartum and whole transition period feeding more effective in improving fat-corrected milk yield. Feeding NCG after calving reduced serum aspartate aminotransferase activity in cows (P<0.05). NCG supplementation tended to increase serum interleukin-6 content before calving and decrease interleukin-6 after calving (0.05<P<0.10). In conclusion, NCG supplementation during the pre-calving, post-calving and whole transition periods can increase milk yield and milk protein content of cows, and the addition of NCG during the post-calving and whole transition periods has a better effect on milk yield. However, NCG supplementation has less effect on the serum biochemical and immune parameters of periparturient cows.

Cite this article

DONG Xusheng , LI Yuanjie , FA Wenjing , LIN Xueyan , HU Zhiyong . Effects of N-Carbamylglutamate Supplementation on Milking Performance, Serum Biochemical and Immunity Parameters in Transition Cows[J]. Chinese Journal of Animal Nutrition, 2021 , 33(12) : 7140 -7147 . DOI: 10.3969/j.issn.1006-267x.2021.12.053

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