Paper Details

Effect of whole cottonseed, monensin and vitamin E on milk compositions and CLA content of milk fat of lactating dairy cows

Besharati, A. Taghizadeh

DOI: https://dx.doi.org/10.12692/ijb/5.12.420-432

Int. J. Biosci. 5(12), 420-432. December, 2014. (PDF)

Abstract:

The present study was aimed at determining the effects of adding vitamin E and monensin on milk production, milk composition, and the milk fatty acid profile of lactating dairy cows when whole cottonseed, as the main source of FA, was included in the diet. In a balanced 4×4 repeated Latin square design, eight lactating Holstein cows were randomly assigned to one of the four dietary treatments for 28-d treatment period: 1) control diet (without whole cottonseed, monensin and vitamin E; C), 2) diet with 20 percent whole cottonseed of DM (WCS), 3) diet with 20 percent whole cottonseed of DM plus 12000 IU of vitamin E/cow per d (WCS+E), and 4) diet with 20 percent whole cottonseed of DM plus 24 ppm of monensin/kg DMI per cow per d (WCS+M). Protein and lactose  percentages were not significantly affected by experimental treatments, but 4% FCM, milk fat percentage and milk fat yield (kg/day) were significantly different among treatments (p<0.05). Feeding vitamin E supplement increased SCFA and decreased LCFA (p<0.05). The concentration of cis-9, trans-11 CLA was affected by monensin and vitamin E supplementations (p<0.05) and treatments WCS and WCS+M had the highest amount within the experimental treatments. The supplementation of diet by monensin had significant effect on trans-10, sic-12 CLA concentration and increased it (p<0.05). The results of this study showed that supplementation of vitamin E or monensin did not have any effect on milk fat concentration when whole cottonseed is included in the diet whereas affected milk fat compositions.