Estimates of Phenotypic and Genetic Parameters for Pre-Weaning Growth Traits of Arabi Lambs

Mohammadi, Kourosh; Nassiri, Mohammad Taghi Beigi; Fayazi, Jamal; Roshanfekr, H.; Aghaei, Asghar

doi:10.3923/javaa.2010.1819.1823

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…This result is similar to the findings of Ulutas et al (7). Mohammadi et al (16), on the other hand, determined that the best model was model 3, which is the model that took into account both the direct and maternal additive genetic effects.…”

Section: Bw Estimates Of Hsupporting

confidence: 90%

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Estimates of genetic parameters for different body weights andmuscle and fat depths of Karayaka lambs

Aksoy¹,

Ulutaş²,

Şen

et al. 2016

Turk J Vet Anim Sci

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In the current paper the direct additive and maternal genetic effects on birth, weaning (at 90 days of age), and scanning (at 20 weeks of age) weights and muscle and fat depths of the ribeye area in Karayaka lambs were investigated. Analyses were carried out by the restricted maximum likelihood approach, fitting 6 animal models with various combinations of direct and maternal effects. The best model was chosen after testing for improvement in the log-likelihood values. Direct heritability (h 2 d) for all traits decreased when maternal genetic effects were included in the models. The maternal heritability (h 2 m) ranged from 0.15 to 0.22 for birth weight, from 0.04 to 0.14 for weaning weight, and from 0.08 to 0.16 for scanning weight. The effects of h 2 m on muscle depth and fat depth of the ribeye area were not considered due to their insignificance. The permanent environmental effect of the dam was significant for birth, weaning, and scanning weights. Moderate negative genetic correlations (r am) between the direct and maternal genetic effects were observed, which were significant for birth (-0.179 and-0.221), weaning (-0.310 and-0.415), and scanning (-0.116 and-0.141) weights. As a result, h 2 d and h 2 m can be used as selection criteria for birth, weaning, and scanning weights in Karayaka lambs.

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Section: Bw Estimates Of Hsupporting

confidence: 90%

“…The lack of a maternal genetic effect might have resulted from the small size of the data set. Mohammadi et al (16) previously determined in another study that the best model was model 3, which is the model that took into consideration the direct and maternal additive genetic effects.…”

Section: Wwmentioning

confidence: 99%

Estimates of genetic parameters for different body weights andmuscle and fat depths of Karayaka lambs

Aksoy¹,

Ulutaş²,

Şen

et al. 2016

Turk J Vet Anim Sci

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“…Using model II, direct heritability and heritability due to maternal permanent environment were estimated to be 0.17. Estimated values agreed with the value estimated for the Arabi sheep breed (another Iranian fat-tailed sheep) using the same model (Mohammadi et al, 2010).…”

Section: Average Daily Gain From Birth To Weaningsupporting

confidence: 57%

Genetic analysis of growth traits in IranianMakuiesheep breed

Jafari

Hashemi

Manafiazar

et al. 2012

Italian Journal of Animal Science

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The Makuie sheep is a fat-tailed sheep breed which can be found in the Azerbaijan province of Iran. In 1986, a Makuie sheep breeding station was established in the city of Maku in order to breed, protect and purify this breed. The genetic parameters for birth weight, weaning weight (3 months), 6-month, 9-month and yearling weight, and average daily gain from birth to weaning traits were estimated based on 25 years of data using DFREML software. Six different models were applied and a likelihood ratio test (LRT) was used to select the appropriate model. Bivariate analysis was used to define the genetic correlation between studied traits. Based on the LRT, model II was selected as an appropriate model for all studied traits. Direct heritability estimates of birth, weaning, 6month, 9-month and yearling weights and average daily gain from birth to weaning were 0.36, 0.41, 0.48, 0.42, 0.36 and 0.37, respectively. Estimates of direct genetic correlation between birth and weaning weights, birth and 6-month weights, birth and 9-month weights, as well as between birth and yearling weights were 0.57, 0.49, 0.46 and 0.32, respectively. The results suggest there is a substantial additive genetic variability for studied traits in the Makuie sheep breed population, and the direct additive effect and maternal permanent environment variance are the main source of phenotypic variance.

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“…The current estimate is higher than 0.16 estimated by [12] for Kenya Dual Purpose goats, 0.18 estimated by [25] for Toggenburg goats in Kenya, 0.04 observed by [23] for indigenous Nigeria goats, 0.18 shown by [26] for Adani goats and 0.06 observed by [27] for Sudan desert goats. However, it was also lower than 0.4 estimated for SEA goats by [11], 0.04 estimated by [28] for Sudanese Nubian goats and 0.35 estimated by [19] for Damascus goats. Weight at 32 weeks of age, yearling weight, pre-weaning growth rate, post-weaning growth rate and birth to yearling growth rate were generally poorly heritable.…”

Section: Discussioncontrasting

confidence: 59%

Genetic Parameters for Growth Traits of Malya Goats and Heterosis from Crossbreds of Malya and Sukuma Goats

Chavala,

Kifaro,

Tungu

et al. 2023

AJRAVS

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The study estimated heterosis of growth traits from crossbred progeny of MalyaxSukuma goats and heritability, genetic correlation and phenotypic correlation for growth traits of Malya goats in Maswa, Tanzania. The objective was to explore strategies for crossbreeding Malya goats with the Sukuma goats. Growth performance data recorded during the implementation of a crossbreeding project for parent breeds and crossbred off-springs were used to estimate the parameters. Positive heterosis was observed for birth weight (8.19%), yearling weight (9.59%), post-weaning growth rate (19.26%)

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Estimates of Phenotypic and Genetic Parameters for Pre-Weaning Growth Traits of Arabi Lambs

Cited by 8 publications

References 21 publications

Estimates of genetic parameters for different body weights andmuscle and fat depths of Karayaka lambs

Estimates of genetic parameters for different body weights andmuscle and fat depths of Karayaka lambs

Genetic analysis of growth traits in IranianMakuiesheep breed

Genetic Parameters for Growth Traits of Malya Goats and Heterosis from Crossbreds of Malya and Sukuma Goats

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