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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front. Agric. China    2008, Vol. 2 Issue (1) : 121-124     DOI: 10.1007/s11703-008-0021-7
Response of lactating cows to supplemental rumen protected methionine and Niacin
JIA Wenbin, LI Qiufeng, GAO Yanxia, LI Jianguo, CAO Yufeng
Department of Animal Science and Technology, Agricultural University of Hebei;
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Abstract Eight Chinese Holstein cows were used in a 4 × 4 Latin square design to determine the effects of rumen protected methionine (RPMet) and Niacin on milk yield and milk composition of lactating cows with 14 d adaptation and 6-d sampling periods. The cows were fed the control diet or the control diet plus RPMet (25 g·d-1), niacin (6 g·d-1), or RPMet (25 g·d-1) + niacin (6 g·d-1). The results showed that RPMet supplementation in the diet increased 4% fat corrected milk (FCM) yield (P < 0.05) and milk fat percentage (P < 0.05). However, supplemental RPMet had no effect on the solid non fat (SNF) (P > 0.05) and lactose percentage (P > 0.05). Dietary niacin supplementation increased milk yield (P < 0.05), milk protein percentage (P < 0.05) and lactose percentage (P < 0.05), but had no effect on milk fat percentage (P > 0.05) and SNF (P > 0.05). RPMet supplementation in the diet of lactating cows significantly decreased serum urea nitrogen (P < 0.01) and glucose contents (P < 0.05), but had no effects on nonesterified fatty acids (NEFA), total cholesterol and triglyceride (P > 0.05). Niacin supplementation influenced the contents of glucose and NEFA in serum, but had no effects on the urea nitrogen, total cholesterol and triglyceride (P > 0.05).
Issue Date: 05 March 2008
 Cite this article:   
JIA Wenbin,LI Qiufeng,GAO Yanxia, et al. Response of lactating cows to supplemental rumen protected methionine and Niacin[J]. Front. Agric. China, 2008, 2(1): 121-124.
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