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20111
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Subject: Animal Nutrition × Author: Swami Vijay Chandrashekhar × End date: 2011 × Start date: 2011 × Type: Thesis ×
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    ThesisItemOpen Access
    Effect of Zinc Supplementation on the Lactational Performance of Dairy Cows
    (Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar, 2011-01-15) Swami Vijay Chandrashekhar; Chandrapal Singh, K.; Gideon Gloridoss, R.; Krishnamuoorthy, U.; Prabhu, T.M.
    Eight crossbred cows (Holstein Friesian × Sahiwal) in midlactation were used in Youden latin square design (3 x 3) to determine the effect of Zn supplementation (as ZnSO4) on the lactational performance of dairy cows. Lactation trial comprised of three groups of cows fed three treatment diets viz. T1, T2 and T3, receiving three levels of Zn supplementation viz. 50, 250 and 500 ppm. Diets contained corn silage, ragi straw and a compounded feed mixture. Animals were fed daily with fixed quantities of corn silage (20 kg) and ragi straw (1 kg). The allowance of CFM for individual cows varied to supply the required treatment ME. Dry matter intake (12.13, 12.57 and 12.47 kg/day for T1, T2 and T3 treatments, respectively) was not significantly different between treatment groups. The total and FCM yield was similar among the treatment groups. The composition of fat (5.04, 4.98 and 5.05 for T1, T2 and T3, respectively), SNF (9.76, 9.93 and 10.14 per cent for T1, T2 and T3, respectively), protein (3.65, 3.65 and 3.73 per cent for T1, T2 and T3, respectively) and lactose (5.42, 5.59 and 5.63 per cent for T1, T2 and T3, res.pectively) in the milk of cows were not significantly different between the treatment groups. No significant difference was noticed in body weight gain of animals. The Zn content of the milk for 50, 250 and 500 ppm Zn diets were 8.86, 10.70 and 12.40 (mg per kg milk) respectively. The increase in the Zn content was consistent and linear with the level of Zn in the diet (P<0.05). It was concluded from the study that the Zn supplementation increased the nutritional value of milk in terms of increased Zn content of the milk.