Study on growth and reproductive traits of Nellore sheep in semi-arid region of Andhra Pradesh

Kumar, Ish; Gangaraju, G.; Kumar, C. Vijaya; Nath, Sapna

doi:10.5958/0973-9718.2017.00065.4

Cited by 4 publications

(10 citation statements)

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“…Maternal genes influence the uterine environment, uterine capacity, and quality for fetal growth and, thus, lamb birth weight [ 29 ]. Previous findings in several sheep breeds in India [ 25 , 26 , 30 , 31 ] were similar to the estimated maternal heritability. However, higher estimates were reported for Kermani [ 24 ] and Malpura [ 29 ] lambs.…”

Section: Discussionsupporting

confidence: 83%

“…In this study, the maternal heritability found in weaning weight was moderate (0.11), which is about the same as what was found in Kermani [ 24 ] but lower than what was found in Malapura [ 22 , 29 ] and Nellore [ 26 ]. Pre-weaning body weight traits’ predicted heritability showed that the maternal additive genetic contribution was greatest at birth and waned as we got closer to weaning.…”

Section: Discussionsupporting

confidence: 77%

“…It was comparable with reported findings in various tropical sheep breeds [ 11 , 21 – 23 ]. However, this estimate was comparatively higher than those estimated in Malapura [ 6 ], Nilagiri [ 7 ], Corriedale [ 12 ], Kermani [ 24 ], Chokla [ 25 ], and Nellore [ 26 ] lambs. Higher heritability in Mecheri sheep was previously reported [ 27 ], in a study in which maternal effects evaluation was absent.…”

Section: Discussioncontrasting

confidence: 57%

“…The estimate from the current study was less than that for Nellore [ 9 ] and Malpura [ 6 , 22 ] sheep. Weaning weight in various sheep breeds was estimated to have lower heritability values [ 7 , 26 , 35 ]. Lamb weight at weaning had a lower heritability than lamb birth weight.…”

Section: Discussionmentioning

confidence: 99%

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Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

Balasundaram,

Muralidharan,

Murali

et al. 2023

PLoS ONE

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The progression of genetic selection techniques to enhance farm animal performance traits is guided by the present level of genetic variation and maternal impact in each trait, as well as the genetic association between traits. This study was conducted on a population of Mecheri sheep maintained from 1980 to 2018 at Mecheri Sheep Research Station, Pottaneri, India, to determine variance and covariance components, as well as genetic parameters for various production performance traits. A total of 2616 lambs, produced by 1044 dams and 226 sires, were examined in the study and the production traits of Mecheri sheep assessed include birth weight (BW), weaning weight (WW), six-month weight (SMW), nine-month weight (NMW), and yearling weight (YW). The Bayesian approach, using the Gibbs sampler, analyzed six animal models with different combinations of additive direct and maternal additive effects. Direct genetics, maternal genetics, and residual effects models were the major contributors to total phenotypic variation for all the production traits studied. Direct heritability estimates of birth weight, WW, SMW, NMW, and YW were 0.25, 0.20, 0.12, 0.14, and 0.13, respectively. The maternal heritability estimated for BW, WW, SMW, NMW, and YW were 0.17, 0.10, 0.12, 0.14, and 0.14, respectively. The maternal effects had a major impact on the pre-weaning production traits. The genetic correlations estimated between different pairs of production traits studied ranged from 0.19 to 0.93. The body weight at birth exhibited a higher genetic relationship with weaning weight than post-weaning growth characteristics, and the genetic correlation between weaning weight and post-weaning attributes was moderate to high (0.52 to 0.72). Based on the additive genetic variance in weaning weight and the correlation estimates of weaning weight with post-weaning traits, weaning weight was proposed as a selection criterion for improving growth traits in Mecheri sheep.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 77%

Section: Discussioncontrasting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

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Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

Balasundaram,

Muralidharan,

Murali

et al. 2023

PLoS ONE

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“…The weaning weight of the lambs reared in different systems in the present study was similar to the findings of Raman et al (2003), Mishra et al (2004) in Ganjam sheep and Kumar et al (2017c) in Nellore jodipi sheep, but higher weaning weights were reported by Lalit et al (2016) in Harnali sheep. Growth Performance and Biometry of Nellore Brown Lambs from Birth to Weaning under Different Systems of Rearing…”

Section: Body Weight Gainsupporting

confidence: 91%

Growth Performance and Biometry of Nellore Brown Lambs from Birth to Weaning under Different Systems of Rearing

Rangamma

Chandra

Rajanna

et al. 2022

IJAR

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Background: Among the three varieties of Nellore sheep, Nellore brown was most popular among the shepherds of Telangana state. The research on the performance of the other two varieties i.e. Palla and Dora was done extensively in their home tract but less data was available about performance of Nellore brown under different system of rearing. The growth rate of lambs was highest from birth to weaning in their life. The system of rearing can influence both growth rate and biometrical measurements of the lamb. The performance of the lambs during this stage influence the productive and reproductive performance in the lifetime. Methods: Sixty Nellore brown ewes (1.5 - 2 years) were selected from Sheep unit, Livestock Research Station, Mamnoor, Telangana for the present study. The lambs born in intensive (G1, lambs born N= 14), Semi-intensive (G2, lambs born N= 14) and Extensive (G3, lambs born N= 12) system of rearing were used to study the growth performance and biometry of lambs from birth to weaning. Result: The birth weight (kg) of lambs in G1 and G2 groups were significantly (P less than 0.01) higher than lambs in G3 group. The weaning body weight (Kg) was significantly higher (P less than 0.01) in G1 group as compared to weaning body weights in G2 and G3 group. The mean average ADG (gm) of lambs from birth to weaning was significantly (P less than 0.01) higher in G1 (105.4±0.19) followed by G2 (97.9±0.14) and G3 (92.8±0.07) group. The mean pin shoulder length (cm) of lambs at birth in G1 group was higher than G2 and G3 group but had a significant (P less than 0.05) difference with the only G3 group. In G1 group, the mean heart girth (cm) of lambs from15th day to weaning was significantly (P less than 0.01) higher than G2 and G3 groups. The mean gain in paunch girth from birth to weaning in lambs of three groups was nearly 19 cm and had no significant (P less than 0.05) difference between groups.

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Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

Balasundaram¹,

Muralidharan²,

Muthialu³

et al. 2023

Preprint

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The progression of genetic selection techniques to enhance farm animal performance traits is guided by the present level of genetic variation and maternal impact in each trait, as well as the genetic association between traits. This study was conducted on a population of Mecheri sheep maintained from 1980 to 2018 at Mecheri Sheep Research Station, Pottaneri, India, to determine variance and covariance components, as well as genetic parameters for various production performance traits. The production traits of Mecheri sheep assessed include: birth weight (BW), weaning weight (WW), six-month weight (SMW), nine-month weight (NMW) and yearling weight (YW). The Bayesian approach using the Gibbs sampler analyzed six animal models with different combinations of additive direct and maternal additive effects was used. Direct genetics, maternal genetics and residual effects models were the major significantly contributors to total phenotypic variation for all the production traits studied. Direct heritability estimates of birth weight, WW, SMW, NMW and YW were 0.25, 0.20, 0.12, 0.14 and 0.13, respectively. The maternal heritability estimated for BW, WW, SMW, NMW and YW were 0.17, 0.10, 0.12, 0.14 and 0.14, respectively. The maternal effects had a major impact on the pre-weaning production traits. The genetic correlations estimated between different pairs of production traits studied ranged from 0.19 to 0.93. The body weight at birth exhibited higher genetic relationship with weaning weight than post-weaning growth characteristics, and the genetic correlation between weaning weight and post-weaning attributes was moderate to high (0.52 to 0.72). Based on the additive genetic variance in weaning weight and the correlation estimates of weaning weight with post-weaning traits, the weaning weight was proposed as a selection criterion for improving growth traits in Mecheri sheep.

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Study on growth and reproductive traits of Nellore sheep in semi-arid region of Andhra Pradesh

Cited by 4 publications

References 0 publications

Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

Growth Performance and Biometry of Nellore Brown Lambs from Birth to Weaning under Different Systems of Rearing

Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

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Study on growth and reproductive traits of Nellore sheep in semi-arid region of Andhra Pradesh

Cited by 4 publications

References 0 publications

Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

​Growth Performance and Biometry of Nellore Brown Lambs from Birth to Weaning under Different Systems of Rearing

Development of selection strategies for genetic improvement in production traits of Mecheri sheep based on a Bayesian multi trait evaluation

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Growth Performance and Biometry of Nellore Brown Lambs from Birth to Weaning under Different Systems of Rearing