Animal and poultry genetics and breeding
Neda Farzin; Mahla Ajam; Abolghasem Seraj
Abstract
The aim of the present study was to investigate effect of additive genetic on egg weight, yolk weight and yolk fatty acid content and estimation of heritability for these traits. In this research, 150 white Japanese quails (50 males and 100 females) were used as the base population (without any pedigree ...
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The aim of the present study was to investigate effect of additive genetic on egg weight, yolk weight and yolk fatty acid content and estimation of heritability for these traits. In this research, 150 white Japanese quails (50 males and 100 females) were used as the base population (without any pedigree information). In the F2 generation, 100 female quails were randomly selected at the fifth week of age and transferred to laying cages. The traits included egg weight, yolk weight and yolk fatty acid contents. (Co) Variance components and genetic parameters were estimated using multiple animal models by Wombat software. The estimated heritability for egg weight and yolk weight were 0.45 and 0.38, respectively. These estimates for yolk fatty acids ranged from 0.27 (Palmitoleic acid) to 0.45 (Palmetic acid). Genetic correlations between egg weight and yolk fatty acids were low, ranging from 0.01 (between egg weight and Linoleic acid) to 0.10 (between egg weight and Stearic acid). The higher genetic correlations were between yolk weight and yolk fatty acids, varying from 0.10 (between yolk weight and Linoleic acid) to 0.51 (between yolk weight and Stearic acid). The results showed that selection for increasing the yolk weight could lead to producing eggs with more contents of yolk fatty acids.
Abbas Farshad; Amjad Farzinpour; Shahou Mahmoudi
Abstract
The aim of this study was to evaluate the effects of α- linolenic and linoleic fatty acids, trehalose and sucrose on quality of Markhoz goat frozen-thawed sperm cells. Semen was collected from 4 mature goats using an artificial vagina, evaluated, pooled and divided into 11 aliquots and extended ...
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The aim of this study was to evaluate the effects of α- linolenic and linoleic fatty acids, trehalose and sucrose on quality of Markhoz goat frozen-thawed sperm cells. Semen was collected from 4 mature goats using an artificial vagina, evaluated, pooled and divided into 11 aliquots and extended 1:10 with basic tris diluent containing different fatty acids. The motility, progressive motility, viability, acrosome and membrane integrity of frozen spermatozoa have been evaluated after thawing. The results indicated that α- linolenic was significantly the best diluent, while the linoleic acid decreased significantly the quality of spermatozoa, except membrane integrity. Moreover, the use of trehalose and sucrose in diluents decreased significantly the sperm cells characteristics. In addition, the result presented that α- linolenic acid in combination with trehalose improved significantly the rate of acrosome and membrane integrity, but decreased the motility and progressive motility of frozen-thawed spermatozoa. Moreover, the treatments containing all antioxidants and diluents containing linoleic acid and sugars decreased significantly the rate of assessed parameters. In conclusion, the results in this study indicated that using of 20 mg α-linolenic acid in diluent alone and in combination with trehalose can be suitable for cryopreservation of Markhoz goat sperm cells.
