Effects of Dietary Whole Cottonseed Ratio on Fattening Performance, Serum Biochemical Parameters and Nutrient Apparent Digestibility of Holstein Bulls

WANG Yongsheng, CAO Yufeng, LI Qiufeng, LI Yan, GAO Yanxia, LI Jianguo

doi:10.3969/j.issn.1006-267x.2018.05.041

2018 , Vol. 30 >Issue 5: 1965 - 1972

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.05.041

Molecular Nutrition

Effects of Dietary Whole Cottonseed Ratio on Fattening Performance, Serum Biochemical Parameters and Nutrient Apparent Digestibility of Holstein Bulls

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1. College of Animal Science and Technology, Hebei Agricultural University, Baoding 071001, China;
2. College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China

Received date: 2017-11-09

Online published: 2018-05-06

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Abstract

The purpose of this experiment was to study the effects of dietary whole cottonseed ratio on fattening performance, serum biochemical parameters and nutrient apparent digestibility of Holstein bulls. Forty-four healthy Holstein bulls with similar body weight were randomly divided into 4 groups with 11 bulls in each group. Dietary whole cotton seed ratio was 0, 5%, 10% and 15% for groups Ⅰ, Ⅱ, Ⅲ and Ⅳ, respectively. The levels of energy and crude protein were basically identical in different groups. The pre-trial lasted for 7 d, and the formal trial lasted for 90 d. The results showed as follows:1) average daily gain of group Ⅳ was the highest, which was 9.80% higher than that of group Ⅰ(P<0.05); dry matter intake of group Ⅳ was the highest, and of which the feed/gain was the lowest, but no significant differences were found among groups (P > 0.05). 2) Serum content of insulin-like growth factor 1 in groups Ⅲ and Ⅳ was 4.79% and 6.76% higher than that of group Ⅰ (P<0.05), respectively. With the increment of whole cottonseed ratio, the activities of alanine aminotransferase and aspartate aminotransferase, and the contents of free fatty acid and growth hormone in serum were increased, but no significant differences were found among groups (P > 0.05). 3) Apparent digestibility of neutral detergent fiber, acidic detergent fiber and calcium tended to increase with the increase of whole cottonseed ratio (P>0.05). 4) Compared with group Ⅰ, feed cost per kilogram of weight gain of groupsⅡ, Ⅲ and Ⅳ was reduced by 0.13, 0.17 and 0.26 RMB, respectively. In conclusion, under the conditions of the present experiment, when dietary whole cottonseed ratio was 15%, fattening performance of Holstein bull can be improved.

Key words： fattening performance; serum biochemical parameter; whole cottonseed; Holstein bulls

Cite this article

WANG Yongsheng, CAO Yufeng, LI Qiufeng, LI Yan, GAO Yanxia, LI Jianguo . Effects of Dietary Whole Cottonseed Ratio on Fattening Performance, Serum Biochemical Parameters and Nutrient Apparent Digestibility of Holstein Bulls[J]. Chinese Journal of Animal Nutrition, 2018 , 30(5) : 1965 -1972 . DOI: 10.3969/j.issn.1006-267x.2018.05.041

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