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Bharathy N.,Tamil Nadu Veterinary and Animal Sciences University | Bharathy N.,Mecheri Sheep Research Station | Ramesh V.,Tamil Nadu Veterinary and Animal Sciences University | Kumar V.R.S.,Tamil Nadu Veterinary and Animal Sciences University | And 2 more authors.
Indian Journal of Animal Sciences | Year: 2011

The reproductive performance of both White Giant and Soviet Chinchilla rabbits housed in modern raised platform shed was superior than that of rabbits housed in conventional tile roofed shed. The improvement of microclimate in modern raised platform shed increased the percentage of oestrus occurrence, breeding success, litter size and weight at birth and weaning. Source


Jeichitra V.,Madras Veterinary College | Rajendran R.,Madras Veterinary College | Karunanithi K.,Madras Veterinary College | Karunanithi K.,Mecheri Sheep Research Station | Rahumathulla P.S.,Madras Veterinary College
Indian Journal of Animal Research | Year: 2015

Estimates of breeding values were obtained for weights at birth, 3, 6, 9 and 12 months of age in Mecheri sheep maintained at Mecheri Sheep Research Station, Pottaneri, Tamil Nadu, India, over a period of 16 years (1991 to 2006). Records of 1763 lambs born out of 74 sires were used for the study. Analyses were carried out by least-squares (LS), best linear unbiased prediction (BLUP) and derivative free restricted maximum likelihood (DFREML) methods. Error variance for LS, BLUP and DFREML estimates were 0.153, 0.155 and 0.053; 3.573, 3.589 and 2.082; 6.529, 6.576 and 3.888; 8.697, 8.734 and 4.337 and, 8.324, 8.391 and 4.435 respectively for birth, 3, 6, 9 and 12 months weights. The coefficient of determination (R2) for LS, BLUP and DFREML methods were 24.7, 19.6 and 71.2; 32.6, 28.7 and 48.1; 37.0, 32.6 and 48.1; 39.0, 34.2 and 58.7 and, 46.9, 40.2 and 57.6 for birth, 3, 6, 9 and 12 months weights respectively. Spearman’s rank correlation for DFREML with BLUP and LS estimates were highly significant (P<0.01). The DFREML method seems to be most efficient (lower error variance) and accurate (higher coefficient of determination) method. However, significant and higher magnitude of rank correlations between DFREML and LS showed that LS could be used as next best method. Source


Jeichitra V.,TANUVAS | Jeichitra V.,Madras Veterinary College | Rajendran R.,TANUVAS | Karunanithi K.,TANUVAS | And 2 more authors.
Indian Journal of Animal Research | Year: 2016

Data on 1763 Mecheri sheep, maintained at the Mecheri Sheep Research Station, Pottaneri, Salem, south India, and recorded between 1991 and 2006, were analysed to study the growth related traits and their genetic control. The average weights at birth and at 12 months of age were 2.25 ± 0.01 and 17.48 ± 0.14 kg, respectively. The pre- and post-weaning (3-6, 3-9 and 3-12) average daily weight gains were 63.40 ± 0.58, 39.57 ± 0.57, 37.48 ± 0.44 and 34.31 ± 0.42 g respectively. The heritabilities of body weights and weight gains were in general moderate to high. The phenotypic and genetic correlations among body weights were positive and moderate to high. The phenotypic and genetic correlations among average daily gains were positive and low to high. The estimates of genetic correlation among average daily gains and body weights were positive and high with few exceptions. © 2016, Agricultural Research Communication Centre. All rights reserved. Source


Thiruvenkadan A.K.,Mecheri Sheep Research Station | Thiruvenkadan A.K.,Veterinary College and Research Institute | Karunanithi K.,Mecheri Sheep Research Station | Muralidharan J.,Mecheri Sheep Research Station | And 3 more authors.
Asian-Australasian Journal of Animal Sciences | Year: 2011

Data on 2,365 Mecheri sheep (1,201 males and 1,164 females), maintained at the Mecheri Sheep Research Station, Pottaneri, India, and recorded between 1979 and 2006, were analysed to study the growth related traits and their genetic control. The body weights at different ages (i.e. at birth, weaning (3 months), 6, 9 and 12 months) were recorded and collected from the birth and growth registers maintained in the farm. The average weights of Mecheri sheep at birth, and at 12 months of age were 2.24±0 .01 and 16.81±0.15 kg respectively. The pre- and post-weaning average daily weight gains were 63.84±0.75 and 29.52±0.43 g respectively. Study revealed a significant difference with the period of lambing on body weight, weight gain and efficiency in weight gain at different stages of growth. Males were heavier and had a higher weight gain than females at almost all stages of growth and the differences tended to increase with age. The direct heritability estimates increased from birth to six months of age and then decreased. The direct heritabilities of all body weights at different stages of growth were low to moderate in magnitude and the values at birth, weaning, six, nine and 12 months of age were 0.08, 0.17, 0.21, 0.13 and 0.10 respectively. For the estimation of heritability at birth and three months body weights, the direct additive genetic and maternal additive genetic effects have to be taken into account and for the estimation of six months weight, the direct additive genetic and maternal permanent environmental effects have to be included in the model. The estimates of heritability, phenotypic and genetic correlations among the different body weights indicated that the selection for improving the body weights at different traits should be done on the basis of three or six months weight because of higher heritability estimates and having higher genetic correlations with other traits. Source

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