Effects of Whole Cottonseed on Performance and Blood Biochemical Paramaters of Dairy Cows

ZHONG Rongzhen; GAO Yanxia; CAO Yufeng; LI Qiufeng; LI Jianguo

doi:10.3969/j.issn.1006-267x.2012.08.011

Chinese Journal of Animal Nutrition >

2012 , Vol. 24 >Issue 8: 1477 - 1483

DOI: https://doi.org/10.3969/j.issn.1006-267x.2012.08.011

Molecular Nutrition

Effects of Whole Cottonseed on Performance and Blood Biochemical Paramaters of Dairy Cows

ZHONG Rongzhen ,
GAO Yanxia ,
CAO Yufeng ,
LI Qiufeng ,
LI Jianguo

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1. Department of Animal Science and Technology, Agricultural University of Hebei, Baoding 071001, China;
2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;
3. Research Center of Embryo Engineering Technology in Cattle and Sheep of Hebei, Baoding 071001, China;
4. Cattle Science Institute, Agricultural University of Hebei, Baoding 071001, China

Received date: 2012-02-08

Online published: 2012-08-03

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Abstract

This experiment was conducted to study the effects of dietary whole cottonseed (WCS) on performance and blood biochemical paramaters of dairy cows. A 4×4 Latin square design was used. Eight multiparity Holstein cows in early lactation were selected and assigned randomly into 4 groups with 2 replicates in each group and 1 cow per replicate. Cows in group A (control group) were fed a basal diet, and cows in groups B, C and D were fed experimental diets contained 5%, 10% and 15% WCS, respectively. The experiment contained four period, and each period lasted for 28 d with 7-d adaptation period and 21-d formality period. The results showed as follows: 1) with the increasing of WCS percentage, milk yield of dairy cows tended to be increased (P>0.05), and the milk fat percentage and 4% fat corrected milk (FCM) was significantly increased (P＜0.01). Deitary WCS had no effects on the milk protein percentage, lactose percentage and milk NFS percentage (P＞0.05). 2) Dietary WCS level had no effects on the apparent digestibilities of crude protein, ether extract and acid detergent fiber (P＞0.05), but it significantly increased the apparent digestibility of neutral detergent fiber (P＜0.05), the apparent digestibility of neutral detergent fiber in group C were increased by 8.4%,and higher than that in the control group (P＜0.05). 3) Dietary WCS level had no effects on contents of albumin and glucose in serum (P＞0.05), but it significantly affected the contents of cholesterol and urea nitrogen in serum (P＜0.05). Serum cholesterol content in group C was significantly lower than that in other groups. Serum urea nitrogen content in groups B and C was significantly lower than that in groups A and D. 4) The free gossypol content in serum and milk was significantly increased with the WCS percentage increasing (P＜0.01). Milk free gossypol content had no significant difference among groups B, C and D(P＞0.05), In conclusion, for dairy cows in early lactation period, the optimal percentage of WCS in the diet is 10%.

Key words： whole cottonseed; dairy cow; performance; milk composition; gossypol

Cite this article

ZHONG Rongzhen , GAO Yanxia , CAO Yufeng , LI Qiufeng , LI Jianguo . Effects of Whole Cottonseed on Performance and Blood Biochemical Paramaters of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2012 , 24(8) : 1477 -1483 . DOI: 10.3969/j.issn.1006-267x.2012.08.011

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