PATEL, D. C.MALDHURE, CHANCHAL A.2018-06-062018-06-062008http://krishikosh.egranth.ac.in/handle/1/5810049390The present experiment was planned and conducted to know the effect of feeding formaldehyde treated Guar meal (Cyamopsis tetragonolobd) to lactating dairy cows. The feeding experiment was conducted on 18 lactating crossbred cows at an organized dairy cattle farm in Davalpura village of Anand District. The average daily milk production of cows was 14 - 15 kg /cow and milk fat 3.4 to 4.2 % in the beginning of the study. The selected cows were divided into two groups of nine cows in each treatment following completely randomized design. The cows in control group (Tl) were fed as per the feeding schedule followed by the farmer (concentrate + maize husk + green roughage + dry roughage) and those in experimental group (T2) were reared on farm feeding schedule + formaldehyde treated Guar meal. Experimental feeding of individual cow was carried out for the period of 120 days. The daily milk production and feed intake of cows was recorded. The fat %, SNF % and total solids % were recorded at fortnightly interval. A digestibility trial of 7 days collection was conducted in the middle of experiment. The average daily milk production during experiment was 15.42 and 16.86 kg/cow under T1 and T2, respectively and total milk yields was found to be 16651.11 and 18212.88 kg, respectively. The cows under T2 produced 9.09 % higher milk than T1 cows. The average daily increase in milk production was 1.4 kg/cow in T2, over the cow of T1 group. However, the differences were statistically non significant. The average milk fat content under T1 and T2 was 3.9 and 4.2 %, respectively. These differences were found to be significant (P<0.05). The average daily fat yield per cow was 0.59 and 0.69 kg under T1 and T2, respectively. The Guar meal supplemental group recorded 16.9 % more fat yield than control and the differences were found to be highly (P<0.01) significant. The total FCM yields were 16278.50 and 18244.21 kg, respectively. The cows under T2 group produced 12.07 % higher FCM than T1 cows but the differences between the treatments were statistically similar. The average DMI was found to be 14.80 and 13.58 kg/cows under T1 and T2, respectively. The average values for roughage: concentrate ratio was 1.46:1 and 1.26:1 under T1 and T2, respectively. The supplementation of bypass protein showed significant (P<0.01) effect on dry matter intake in dairy cows. However, the average daily CP, DCP and TDN intake was statistically similar. The digestibility of nutrients in experimental cows for dry matter (64.68±1.84; 68.86±1.52), organic matter (68.38±2.09; 70.56±1.47), crude protein (72.89±1.01; 74.47±0.33), ether extract (79.16±1.33; 81.51±1.14) and NFE (57.35±2.08; 60.46±2.01) was similar in both the groups but that of crude fiber (66.38±1.60; 72.71±1.61) was significantly higher (P<0.01) in T2 compared to control group. The feed conversion efficiency (kg DMI/kg milk and kg DMI/kg FCM) was higher in T2 as compared to T1 group. The daily cost of feeding (Rs/cow) was higher in T1 than T2. The daily return as % of the feed cost was found to be 172.17 and 242.76 in T1 and T2 treatments. respectively. In bypass protein supplemental group there was 70.59 % more (P<0.01) return. Thus the cows fed bypass protein were found to be economically more efficient to produce milk and FCM in comparisons to cows fed control ration. It was concluded that inclusion of Guar meal @ 1 kg/day in the ration of lactating cows increased milk fat % and fat yield resulting in decreased cost of milk production without adversely effecting milk yield, milk composition and general health of cows.enANIMAL NUTRITIONA STUDYThesis