Showing 3 results for Asadi Fozi
Volume 13, Issue 5 (Number 5 - 2011)
Abstract
A crossbreeding experiment involving four Iranian fat-tailed sheep breeds, namely Kurdi (K), Chaal (C), Afshari (A) and Sanjabi (S) was carried out to determine the ram breed effects on productivity of Kurdi fat-tailed ewes (K) under extensive production system. A total of 475 Kurdi ewes were mated to 24 rams from four breeds producing 454 lambs including pure Kurdi, KK, (116 lambs), Afshari × Kurdi, AK, (113 lambs), Chaal × Kurdi, CK, (115 lambs) and Sanjabi × Kurdi crossbreds, SK, (110 lambs). Ram breed had a significant influence on early growth traits of the lambs (P < 0.01). The lambs sired by C rams were significantly heavier at birth and weaning than the other lambs (P < 0.05). Weight at 180 days of age (W180) in crossbred lambs was significantly higher than that of the purebred lambs (P < 0.05) while there was no significant difference among crossbred lambs for W180. Greasy fleece weight of lambs at first shearing (GFW) was significantly affected by ram breed (P < 0.05). Ram breed significantly influenced the fat-tail measurements of the lambs (P < 0.01). Number of lambs born and number of lambs weaned per ewe lambed or per ewe joined were not significantly influenced by ram breed effect, but the effect of ram breed on litter weight at birth and weaning per ewe lambed or per ewe joined was significant (P < 0.05). In general, ewes mated to Chaal ram had higher productivity than those mated to other ram genetic groups.
Volume 15, Issue 6 (11-2013)
Abstract
The aim followed in the present paper was to evaluate the slaughter body and carcass weights as well as the characteristics of hide and leather in Dromedaries (one-hump) and in the crossbred (C. bactrianus×C. droedarius) camels. Fourteen camels from each sex (female and male) representing two genotypes at 21 months of age were utilized. Slaughter weight, hot and cold carcass weights, dressing-out percentage, wet and dry salting hide and leather properties were assessed. There were significant differences in slaughter weights between Dromedary and crossed types (339±10.7 vs. 372±11.1 kg) and as well between male vs. female camels (382±9.7 vs. 326±10.6 kg). Moreover, while the effect of sex was significant on wet hide weight (34±1.2 vs. 29.3±1.2 kg for malesandfemales, respectively), the difference observed between males and females regarding the thickness of hide was non-significant (P> 0.05). Breaking force, tensile strength and elongation of the leather samples decreased with increase in their thicknesses. It was found out that the obtained leather from the camel benefited from such valuable mechanical characteristics as tensile strength and extension with no variations being observed as due to the animal’s sex or genotype.
Volume 25, Issue 2 (2-2023)
Abstract
The genetic evaluation of dairy bulls is based on their daughters’ production, type traits, and fertility. It is unknown how the different number of days open of the daughters of a bull influences its Estimated Breeding Values (EBVs) and ranking in the population. The present study aimed to examine the effect of days open on milk production of Holstein dairy cows and the ranking of the bulls according to their predicted breeding values. A total number of 706,653 test day records of the first parity of 78,517 Iranian Holstein cows in 448 herds during 1991 to 2016 were used. The daughters of the same bulls were allocated into nine groups of days open, the differences of which were 21 days. Data were analyzed using a random regression model and predicted the breeding values of bulls. The effect of herd-year-season on milk yield were significant (P≤ 0.001). The heritability of 270 days milk for the first to ninth groups were estimated to be 0.24(±0.04), 0.26(±0.02), 0.23(±0.02), 0.21(±0.03), 0.18(±0.03), 0.19(±0.04), 0.16(±0.05), 0.17(±0.05) and 0.11(±0.04), respectively. The Spearman rank correlation coefficient of predicted breeding value of the same sires in different groups were 0.60-0.75 (P≤ 0.01). The results showed a negative relation between the number of days open and the predicted breeding value of bulls. It can be concluded that the number of days open affects the prediction of breeding value and ranking of the sires and it should be corrected for, while predicting the breeding value of sires.
