To cite this paper: Mobeen, A., M. Riaz and M.U. Yaqoob, 2017. Effect of by-pass fat supplementation on the performance of Sahiwal dairy cows. AbstractPresent study was conducted to evaluate the effect of by-pass fat supplementation on milk production, composition and weight gain in Sahiwal cows. Twelve dairy cows of same parity, stage of lactation, milk production level and body weight (285-360 kg) were randomly allotted to four treatments (T0, T1, T2 and T3) in such a way that each group had three animals under Completely Randomized Design. The animals received 250, 350 and 450 g of bypass fat supplementation in T1, T2 and T3 whilst animals in T0 served as control group. All animals were maintained under similar managemental conditions. The data of milk production (daily/individually), milk composition and body weight were recorded weekly. Results revealed that milk production and composition differed significantly (p<0.05) in all groups. The highest milk yield was found in T2 (10.45±0.53 kg) and the lowest (6.93±0.53 kg) in control group that was without by-pass fat supplementation. The T2 and T3 differed nonsignificantly (p<0.05) for milk yield and composition. Bypass fat did not affect the body weight gain significantly (p<0.05) in all groups. The milk cost showed significant differences in all treatments. The lowest cost (Pak Rs. 32.20±2.37) was shown in T2 and the highest (Pak Rs.46.14±2.37) in T3 group. It is concluded that 250 g was the optimum amount of bypass fat supplementation to produce milk economically with high fat percentage.
The present study was planned to cope with feed scarcity issue using bypass fat as a non-conventional feed resource. Twentyfour early lactating indigenous dairy animals comprising of twelve Nili-Ravi buffaloes and twelve Sahiwal cows were selected to determine the effect of bypass fat supplementation on daily milk yield, milk composition and change in body weight. These animals were randomly distributed in to four groups (G0, G1, G2 andG3) having similar parity and milk yield. All the experimental animals were fed with basal ration (Trifolium alexendrinum + wheat straw) and concentrate in equal proportion (3kg day-1 animal-1 ) in addition to 0, 250, 350 and 450g bypass fat animal-1day-1 , respectively. Data collected for each treatment was analyzed under completely randomized design using MINITAB (2000) and the mean was compared using the Tukey’s test (P<0.05). The data revealed a significant effect (P<0.05) on milk production and 3.14 kg day-1 more milk was produced in group G2 compared to control group. Fat corrected milk yield was also enhanced (P<0.05) from 8.25 (G0) to 12.36 kg day-1 (G2). Milk composition in the sense of fat percentage was also improved [5.25 (G0) to 5.78 (G2)] significantly. While average protein content, SNF% and total solids% remained unaffected. Similarly, change in body weight was non-significant. Milk value (Rs./day) was significantly (P<0.05) increased from 512.25 to 747.75 in the group G0 to G2. Form present finding it could be concluded that dietary supplementation of bypass fat in indigenous dairy animals is a better option to increase the milk yield without compromising milk quality and animal health
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