4. Effect of rumen protected fat (rumen bypass fat) on milk yield, composition, and organoleptic traits of Achai Jersey cross cows at livestock research and development station, Surezai, Peshawar, Khyber Pakhtunkhwa, Pakistan
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Abstract
The present study was conducted to find out the beneficial effects of rumen bypass fat on milk fat content, average daily milk production, and organoleptic qualities of milk of Achai Jersey Cross (AJC) cows in med-lactation at the Livestock Research and Development Station (LR & DS) Surezai Peshawar. A total of 16 animals were selected in the mid-lactation period and were divided into four experimental groups, i.e., A, B, C, and D, each group having four animals. Group A served as the control (0 g of bypass fat), while groups B, C, and D received 100 g, 200 g, and 300 g of bypass fat, respectively. The total duration of the research trail was 105 days (3.5 months), during which milk fat content, daily average milk production, and organoleptic qualities were analyzed. Results indicated a significant increase in daily milk production in group D (4.228 liters), followed by group C (3.748 liters) and group B (3.763 liters) as compared to control group A (2.913 liters). The highest percent increase in average daily milk production was recorded in group D (22.317%), followed by group C (12.092%), and group B (5.634%), as compared to control group A (-14.174%), where a reduction in daily milk production was recorded. Supplementation of high levels of bypass fat at 300g/day per animal resulted in a significant increase in milk fat content in group D (5.07%), followed by C (4.40%) and B (4.12%) as compared to control group A (3.72%). The highest percent increase in milk fat was indicated in groups D (35.35%), C (18.12%) and B (12.99%) as compared to control group A (2.72%), respectively. The organoleptic qualities of all of the tested parameters were equally accepted among all of the members of the panel. It was concluded that supplementation of bypass fat at 300g/day per animal has a significant effect on milk fat content, average daily milk production, and different organoleptic properties of milk in the studied cross-bred animals.
Keywords: Achai Jersey Cross; Bypass fat; Khyber Pakhtunkhwa; Mid-lactation; Milk fat