masoomeh bagheri; Mohammad Moradi shahr babak; Rasoul Vaez torshizi
Volume 39, Issue 1 , February 2009
Abstract
Records of 2593 baluchi ewes, obtained from Baluchi Sheep Breeding Station in Abbas Abad, Mashhad, were used to estimate genetic parameters for total weight of lamb weaned per ewe joined (TWW/WJ) in different parities. Estimates of heritability for TWW1/EJ, TWW2/EJ, TWW3.EJ and TWW4/EJ were 0.112 ? 0.030, ...
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Records of 2593 baluchi ewes, obtained from Baluchi Sheep Breeding Station in Abbas Abad, Mashhad, were used to estimate genetic parameters for total weight of lamb weaned per ewe joined (TWW/WJ) in different parities. Estimates of heritability for TWW1/EJ, TWW2/EJ, TWW3.EJ and TWW4/EJ were 0.112 ? 0.030, 0.028 ? 0.030, 0.075 ? 0.060 and 0.135 ? 0.120, respectively. Direct additive genetic correlations were positive and high, to medium ranging from 0.955 (between TWW1/EJ and TWW2/EJ) to 0.362 (between TWW2/EJ and TWW4/EJ). The corresponding estimates for phenotypic correlations were also positive, but lower than genetic correlations and varied from 0.147 (between TWW3/EJ and TWW4/EJ) to 0.204 (between TWW2/EJ and TWW4/EJ). The high genetic correlation between TWW1\EJ and other composite reproduction traits indicated that lifetime reproductive perfomance can be improved through selection for TWW1\EJ.
Reza Tohidii; Rasoul Vaez torshizi; Mohammad Moradi shahr babak; mohammad bagher sayad nejad
Volume 39, Issue 1 , February 2009
Abstract
A pedigree file of 382831 Holstein cows and bulls, collected from herds registered by Animal Breeding Center of Iran during 1967 to 1999, was used to calculate the inbreeding coefficient. The mean inbreeding coefficient for the whole population (male and female), on a base year of 1946, was 0.184%. The ...
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A pedigree file of 382831 Holstein cows and bulls, collected from herds registered by Animal Breeding Center of Iran during 1967 to 1999, was used to calculate the inbreeding coefficient. The mean inbreeding coefficient for the whole population (male and female), on a base year of 1946, was 0.184%. The means for cows (94 percent of the whole population) and bulls (6 percent of the whole population) were 0.180% and 0.240%, respectively. Minimum inbreeding coefficient was zero, while the maximum values were 39.844, 39.844, and 25.780 for the whole population, cows and bull populations, respectively. In this population 9.5, percent of animals were inbred with a mean inbreeding coefficient of 2.175%. The regression coefficients of inbreeding on year for the whole population and for the population of cows were similar and positive (0.021%). This regression was positive for bulls but higher than that for the population of cows (0.026%).
parvin shawrang; ali nikkhah; ahmad zare shahne; gholam reza raies ali; mohammad moradi shahr babak; ali asghar sadeghi
Volume 39, Issue 1 , February 2009
Abstract
This study was carried out to determine the effects of gamma irradiation on dry matter (DM) and on crude protein (CP) degradation of rapeseed meal, using nylon bags and SDS-PAGE techniques. Ruminal nylon bags of either untreated or irradiated rapeseed meal at doses of 25, 50 and 75 kGy were suspended ...
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This study was carried out to determine the effects of gamma irradiation on dry matter (DM) and on crude protein (CP) degradation of rapeseed meal, using nylon bags and SDS-PAGE techniques. Ruminal nylon bags of either untreated or irradiated rapeseed meal at doses of 25, 50 and 75 kGy were suspended in the rumen of four non-lactating Holstein cows for up to 48 h. Intestinal crude protein digestibility was assessed using mobile nylon bag technique. Subunits of rapeseed meal proteins and disappearance patterns were traced and determined using sodium dodecyl sulphate polyacrylamid gel electrophoresis and densitometrical scanning. There were significant differences (P
