Impact of maternal components on fitting of animal models in genetic parameters estimation for body weight traits in Rahmani lambs

Radwan, Hend; Shalaby, N.; Gabr, A. A.

doi:10.18805/ijar.b-568

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Body weight of lambs at different age stages influenced the development of sheep production enterprises and birth weight is an economically important trait in any sheep breed because it affects on growth rate before weaning period (Radwan et al, 2018). In this study, the comparison of lamb weight at each stage between primiparous and multiparous ewes were shown in Table 6.…”

Section: Lamb Weightmentioning

confidence: 98%

The Expression of Maternal Behavior in Chinese Hu Sheep and its Effects on Lamb Survival and Body Weight

Geng

Lan-ping

2020

IJAR

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Background: The difference in the maternal behavior expression of sheep can affect the early growth and development as well as the survival of lambs. The characteristics of maternal behavior in primiparous and multiparous ewes were observed to reveal the expression of maternal behavior in Chinese Hu sheep and its effects on early lamb survival and body weight.Methods: In total 527 pregnant ewes with delivery were selected, including 246 primiparous ewes and 281 multiparous ewes. The observation record of maternal behavior began from 10 days before delivery to 3 days after delivery by video recording. The behaviors of ewe to the lamb included licking, suckling, seeking lambs, denial of suckling after delivery, butting and trampling lambs, abandoning lambs, and stealing lambs. Body weight of lambs were recorded including newborn, 7-day-old, 14-day-old and 35-day-old (weaning).Result: There were significant differences in the incidence rate in lamb abandonment and stealing between primiparous and multiparous ewes (P less than 0.05), namely the primiparous ewe group had the higher incidence of undesirable behaviours. However, there were no significant differences in seeking, licking and trampling behaviors between two groups (P greater than 0.05). Lamb survival within 7 days after delivery of multiparous ewes was greater than primiparous ewes (P less than 0.05). The body weights of newborn and 7-day-old lambs in the multiparous ewe group were significantly higher than the primiparous group (P less than 0.05). This study demonstrates that limited significant differences exist between primiparous and multiparous ewes in several aspects of maternal behavior in Chinese Hu sheep. Ewe behavioral expression associated with the birth and care of the neonatal lambs are essential for the survival and growth of the offspring.

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Section: Lamb Weightmentioning

confidence: 98%

The Expression of Maternal Behavior in Chinese Hu Sheep and its Effects on Lamb Survival and Body Weight

Geng

Lan-ping

2020

IJAR

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“…Thus, both direct and maternal components must be considered in order to achieve optimum genetic progress especially in growth traits. Recently many studies have attributed most of the variation in lamb weights to maternal effects (Prince et al, 2010;Abbasi et al, 2012;Gowane et al, 2015;Aguirre et al, 2016;Radwan et al, 2018;Latifi andMohammadi, 2018 andMahala et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Estimates of Maternal Effect and (co)Variance Components for BodyWeight at Different Ages by Animal Model in Chokla Sheep

Choudhary,

Pannu,

Narula

et al. 2024

IJAR

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Background: For this study, information was gathered on 6785 Chokla sheep at the Central Sheep and Wool Research Institute in Bikaner, Rajasthan, India and documented between 1974 and 2020. Methods: (Co)variance components and genetic parameters of weight at birth (BW), weaning (WW), 6, 9 and 12 months of age (6W,9W and YW, respectively) of Chokla sheep, were estimated by average algorithm restricted maximum likelihood (AIREML), fitting six different animal models with various combinations of direct and maternal effects. Result: The direct heritability estimates increased from birth to twelve months of age and values for all the body weight traits except birth weight (0.170) were moderate (0.30-0.50). The maternal influence diminished as age increases and maternal genetic effect (m2) was found to be important and sizeable at weaning stage (0.181). Maternal permanent environmental variance was found to influence the early body weight traits. Negative and high estimate of covariance between direct and maternal effects, resulted in highly inflated values of additive heritability. In this condition, it is more useful to use the total heritability (h2t) for evaluation of the response for selection based on phenotypic values to prevent the use of biased estimates of additive heritability. Genetic and phenotypic correlations among body weights at different ages were positive and ranged from medium to high.

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Impact of maternal components on fitting of animal models in genetic parameters estimation for body weight traits in Rahmani lambs

Cited by 2 publications

References 15 publications

The Expression of Maternal Behavior in Chinese Hu Sheep and its Effects on Lamb Survival and Body Weight

The Expression of Maternal Behavior in Chinese Hu Sheep and its Effects on Lamb Survival and Body Weight

Estimates of Maternal Effect and (co)Variance Components for BodyWeight at Different Ages by Animal Model in Chokla Sheep

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