Sahereh Joezy-Shekalgorabi; Ali Maghsoudi; A.R. Ghiasi; Mohammad Rokouei; Hadi Faraji Arough; Amir Zargaran
Abstract
disadvantages of using sexed semen among dairy producers in terms of outcome and economic efficiency. A questionnaire containing 28 five-choice Likert scale questions was prepared to test the attitudes of respondents concerning the use of sexed sperm in terms of functional, economic, cognitive and ...
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disadvantages of using sexed semen among dairy producers in terms of outcome and economic efficiency. A questionnaire containing 28 five-choice Likert scale questions was prepared to test the attitudes of respondents concerning the use of sexed sperm in terms of functional, economic, cognitive and infrastructural aspects. The respondents were the researchers, consultants and dairy farm employees. The findings indicated that farm employees, unlike the researchers, believed that sexed sperm was effective in reducing dystocia, and the conception rate was not deleteriously affected in differentclimates (P<0.01). Better performance of sex-sorted semen in heifers compared to multiparous cows was significantly confirmed by farm employees and consultants compared to the researchers (P<0.01). According to the researchers, the use sex- sorted semen is uncommon and hence the use of this type of sperm has a higher risk (P<0.01). The results of this study indicated that the attitude of employees in large industrial dairy farms is largely consistent with the scientific facts published in the field of sex-sorted semen, and the disagreement of this
Hamideh Nouri Sadegh; Ali Maghsoudi; Mohammad Rokouei; Hadi Faraju-Arough; Mehdi Jahantigh
Abstract
In the current research, immune system responses against sheep red blood cells (SRBC) and Newcastle disease virus (NDV) in two sexes of both wild and Italian speckled quails were investigated. To compare phenotypic differences of two sexes for humoral immune responses a one-way analysis was applied, ...
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In the current research, immune system responses against sheep red blood cells (SRBC) and Newcastle disease virus (NDV) in two sexes of both wild and Italian speckled quails were investigated. To compare phenotypic differences of two sexes for humoral immune responses a one-way analysis was applied, and a simple animal model using the MCMCglmm package of R software was used for genetic analysis, assuming variance components between the two sexes are different. Phenotypic comparison between males and females did not show a significant difference in any of the strains. In both strains, heritability of humoral immunity in males was higher than females. Results showed, in wild strain, heritability of IgT in males (0.187), and IgY in females (0.177) were higher than other estimates. The highest heritability was related to the NDV, which was estimated to be 0.214 and 0.268 in males and females, respectively. Therefore, genetic selection for IgN can be expected to improve the performance of the birds’ humoral immune system. Likewise, according to the higher estimates of immune responses in males, genetic selection of humoral immune responses for IgN, leads to higher genetic progression.
Fatemeh Mir; Mohammad Rokouei; Gholamreza Dashab; Hadi Faraji- Arough
Abstract
The aim of this study was to design the base breeding plan in Sistani cattle by using of stochastic simulation. For this purpose, three population size (500, 1000, 2000 heads), three levels of herd number (5, 10, 20), two levels of selection intensity (high and low) and two levels of mating method (random ...
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The aim of this study was to design the base breeding plan in Sistani cattle by using of stochastic simulation. For this purpose, three population size (500, 1000, 2000 heads), three levels of herd number (5, 10, 20), two levels of selection intensity (high and low) and two levels of mating method (random and Minimum co-ancestry) were combined together and in total 36 scenarios were compared for 30 years. Results showed that the effect of all factors on the annual genetic gain for total merit, the annual genetic gain of birth weight (except in mating method and selection intensity) and yearling weight, the annual inbreeding rate (except in herd number), generation interval (except in mating method and selection intensity) and selection accuracy of sire and dames was significant. The annual genetic gain in high selection intensity, population size of 2000 and less number of herd (5 herds) was 8.5, 93.2 and 38 percent higher than low selection intensity, population size of 500 and more number of herd (20 herds). Despite having less total genetic gain (11 percent) in Minimum co-ancestry mating, the annual inbreeding rate in this mating method was 18 percent lower than random mating. The results of this study showed that less number of herd, large population size and high selection intensity considered in breeding plans of Sistani cattle and minimum co-ancestry mating used for control of population inbreeding.