Present study was designed to decipher the haemato-biochemical and hormonal profile following bypass nutrient supplementation in Murrah buffaloes during early lactation. Forty Murrah buffaloes just after parturition divided randomly into four equal groups and fed basal diet constituting common green fodder and wheat straw, while two different types of concentrates mixture (CM) having 25 (CM1, for group fed control or bypass fat, BPF diet) and 40 percent (CM2 for group fed bypass protein, BPP and BPP with BPF, BPPF diet) of BPP using variable feed ingredients in CM. Animals of group BPF and BPPF additionally fed 15 g bypass fat (long chain fatty acid of calcium salt) for each kg of milk produced for initial 90 days of lactation. Blood sampling was carried out at 0 day (before starting supplementation) and thereafter at an interval of one month, till 120th day after parturition, to find out the effect of supplementation as well is after effects. Significant reduction (P LT 0.05) in serum urea on day 60 was observed in bypass protein fed groups (BPP and BPPF) remains indicative of efficient nitrogen utilization. Thus overall mean total protein in bypass protein fed groups (BPP and BPPF) was higher (P LT 0.05) than control group. Values of albumin also on day 90 (P LT 0.01), 120 (P LT 0.05) as well as overall mean remained higher (P LT 0.001) in group fed CM high in rumen protected protein (BPP and BPPF) than groups fed low bypass protein CM (control and BPF). Supplementation of BPPF improved (P LT 0.05) overall mean cholesterol level as compared to control. Reduction (P LT 0.05) in low density lipoprotein values was observed on day 60 in BPF group as compared to others, while overall mean high density lipoprotein (HDL) in bypass protein fed groups (BPP and BPPF) was found to be higher (P LT 0.01) as compared to others. IGF-1and BHBA showed non-significant difference in all treated groups at different intervals in addition of haematological parameters. It may be concluded that feeding of bypass protein (BPP and BPPF) improved serum overall total protein, albumin, cholesterol and HDL in post-parturient Murrah buffaloes during early lactation.

In this research, Data of milk yield, fat and protein percentage of Khuzestani buffalo were used. The daily records of milk yield were collected in the south-west of Iran where buffalo experienced a hot climate. The data set was constructed with 8,123 records of 1,430 first lactation buffalo. A univariate random regression model (RR/CF) was applied to data. Regression of additive genetic effect based on Legendre polynomials from the day of lactation was considered in the model. The results showed that maximum residual variance for the milk and fat production was estimated at the beginning of the lactation period. The minimum amount of additive genetic variation of milk and fat traits was seen in the early lactation period and the maximum amount of the component was estimated at the end of the lactation period. The lowest heritability of the mentioned traits was at the beginning of the lactation period. The level of this parameter increased to mid-lactation and was at its maximum during the late months of lactation, then decreased to the end of lactation. The estimated additive genetic correlations between close test-days were higher than faraway test-day records for each milk yield and milk fat content. Based on the results of this study, a random regression model with fitting orders 3 and 4, seems to be suitable for additive covariance functions in order to analyze the milk test-day records of buffaloes.

Data on 4971 test-day milk yield traits [milk (TDMY), fat (TDFY) and protein (TDPY)] for 691 Egyptian buffalo cows, daughters of 120 sires and 532 dams were used for fitting the lactation curve parameters of milk, fat and protein yields using multiple-trait animal model. The random effects included in the model were direct additive genetic, permanent environment and error, while the fixed effects were herd test-day, year and season of calving and parity as well as days in milk as a covariable. The means for TDMY, TDFY, TDPY and lactation curve parameters [initial (a), ascending slope (b), descending slope (c), persistency (P), and maximum milk production during lactation (Ymax) and the peak test-day (PY)] were estimated. Heritabilities of TDMY, a, b, c, P, PY and Ymax were 0.22, 0.37, 0.38, 0.39, 0.37, 0.37 and 0.38, respectively. The corresponding heritabilities for TDFY and fat curve parameters were 0.21, 0.41, 0.40, 0.39, 0.38, 0.36 and 0.42, while the estimates for TDPY and protein curve parameters were 0.22, 0.38, 0.40, 0.40, 0.38, 0.40 and 0.43, respectively. Genetic correlations among TDMY and curve parameters of a, b, c, P, PY and Ymax were 0.31, -0.23, -0.34, 0.52, 0.48 and 0.87, respectively. Genetic and phenotypic correlations between milk yield traits were high (mostly of 0.83 and 0.99), like the correlations between curve parameter in milk, fat and protein (from 0.71 to 0.96). In practice, genetic selection for lactation curve parameters (a, P and Ymax) in the Egyptian buffalo would improve total milk yield traits.

This study was conducted to analyze the consequence of prill fat and rumen protected choline (RPC) supplementation on performance of lactating Murrah buffaloes. Murrah buffaloes (n=18) were distributed into three groups (Control, T1 and T2) having six buffaloes in each, based on milk yield, fat per cent and stage of lactation. During the experimental period of 90 days, buffaloes in all the three groups were fed same basal diet, containing green fodder (Berseem), wheat straw and concentrate mixture to meet their requirements for maintenance and milk production. Buffaloes in Group T1 were daily supplemented with prill fat 2.5 percent of total DMI whereas; buffaloes in Group T2 were daily supplemented with 54 g rumen protected choline along with same quantity of prill fat fed as in Group T1. In contrast to the control group, overall milk yield (kg) of lactating Murrah buffaloes was significantly (P LT 0.01) increased by 0.99 and 1.78 kg in Group T1 and T2. The average 4 percent FCM (kg/d), ECM (kg/d) and fat yield (kg/d) was significantly (P LT 0.01) higher in Group T2 followed by Group T1 and Group control. There was no significant difference in milk composition of buffaloes except milk fat (percent) and total solids (percent) which were improved significantly (P LT 0.01) in supplemented groups. It was observed that prill fat supplementation in the ration helped to make better performance of early lactating Murrah buffaloes by enhanced milk yield and fat percent which can be further increased by supplementing the ration with rumen protected choline. Overall milk yield (kg) of lactating Murrah buffaloes was significantly (p LT 0.01) increased by 0.99 and 1.78 kg in T1 and T2 groups, as compared to the control group. The average 4 percent FCM (kg/d), ECM (kg/d) and fat yield (kg/d) was significantly (p LT 0.01) higher in T2 group followed by T1 and control group. There was no significant difference in milk composition of buffaloes except milk fat (percent) and total solids (percent) which were improved significantly (p LT 0.01) in supplemented groups. It was concluded that prill fat supplementation in the ration helped in improving performance of early lactating Murrah buffaloes by increasing milk yield and fat percent which can be further enhanced by supplementing the ration with rumen protected choline.