Supplementation with whole cottonseed changes milk composition and milk fatty acid profile in dairy cows
O. Dayani A C , G. R. Ghorbani B and A. K. Esmailizadeh A
+ Author Affiliations
- Author Affiliations
A Department of Animal Science, College of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
B Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran.
C Corresponding author. Email: odayani@mail.uk.ac.ir
Animal Production Science 51(2) 95-101 https://doi.org/10.1071/AN10026
Submitted: 11 February 2010 Accepted: 20 September 2010 Published: 28 January 2011
Abstract
Eight multiparous Holstein cows in mid lactation (average days in milking of 160 ± 40) were used in a replicated 4 by 4 Latin square design, each experimental period lasting 3 weeks, to determine the effects of whole cottonseed (WCS) treatment and dietary crude protein (CP) concentration on the profile of milk fatty acids. Each 3-week experimental period consisted of 2 weeks for ration adaptation followed by 1 week for data collection. The experimental diets consisted of: (1) Control (without WCS), 16% CP; (2) 20% WCS, 16% CP; (3) 20% WCS, 13% CP; and (4) 20% crushed WCS, 13% CP. Minerals and vitamin supplements were the same in all experimental diets. The WCS treatment led to increased DM intake, fat-corrected milk yield, fat concentration, proportion of long-chain fatty acids, unsaturated fatty acids and ratio of unsaturated to saturated fatty acids (P < 0.05). Decreased concentration of dietary CP from 16 to 13% (diet 2 compared with diet 3) led to a decrease in both milk yield and milk composition (P < 0.05). WCS crushed in diets with 13% CP (diet 4 compared with diet 3) increased (P < 0.05) the concentration of conjugated linoleic acid in milk fat. The results demonstrated that adding WCS to the diet of lactating cows improves both milk yield and milk fatty acid profile, particularly the proportion of conjugated linoleic acid.
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