Cryopreservation is connected with increased undesirable premature sperm capacitation, reduced lifespan and fertility results. Taurine acts as an antioxidant improving the semen quality after cryopreservation. The objective of the current study is to assess the effect of addition of different levels of taurine amino acid to tris-extender on bull sperm cryo-preservability. Methods: The collected semen samples were pooled and diluted with tris-citric acid-fructose egg yolk extender (control, 0 percent taurine) and different concentrations of taurine (10 mM, 20 Mm, 30 Mm, 40 Mm, 50 Mm, 60 Mm, 70 Mm, 80 Mm, 90 Mm and 100 mM) to final concentration of 60 *10**(6) motile sperm/ml. Diluted semen was processed for freezing and evaluated for sperm parameters. Results: Data showed that taurine enriched extender improved sperm parameters during cooling. Post thawing sperm motility percent, membrane integrity percent, Alive sperm percent improved and the percentages of abnormal sperm was lowered upon using taurine enriched extender. Conclusion: It could be concluded that, most the concentrations of taurine in Tris-citrate egg yolk extender ameliorated the post cooling and post freezing semen quality in buffalo bulls.

Data on Egyptian buffalo were analyzed to estimate the effect of age at first calving (AFC, mo) classes on some productive traits [milk yield (MY, kg), milk yield per day, (MY/D, kg), and lactation period (LP, d) and reproductive traits [calving interval (CI, d) and number of services per conception (NSPC, count). Means for AFC were 916+-41, 1143+-72 and 1414+-119 days for early, average and late respectively. Additionally, means of milk yield (MY) for mentioned three levels of AFC were 1780+-774, 1920+-607 and 2040+-812 kg, respectively. Economic evaluations indicated that the profit per buffalo cow during the lifetime production were L.E 62960 (us dollars 3778), L.E 38538 (us dollars 2312) and L.E 3695 (us dollars 222) of early, average and late AFC, respectively. Reducing AFC was a positive influence on lifetime profit per buffalo cow. Lifetime profit rises to about L.E 24400, L.E 59200, and L.E 34800 when AFC decreased to 30 months from (38 months), to 30 months from (55 months) and to 38 months from (55 months), respectively. Heritability estimates for MY, MY/D, LP, CI, NSPC and AFC were 0.39+-0.09, 0.31+-0.07, 0.21+-0.08, 0.15+-0.06, 0.11+-0.07 and 0.57+-0.18, respectively. Genetic correlations between AFC and MY, MY/D, LP, CI, NSPC were -0.146+-0.33, -0.382+-0.30, +0.038+-0.47, +0.530+-0.49 and +0.311+-0.63, successively. The present results revealed that the buffaloes having late AFC were unprofitable during her productive life in the farm, but still needs further investigation of large data with different geographical area and management conditions.

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.