Estimation of Genetic Parameters and Influence of Non Genetic Factors on Wool Yields in German Angora Rabbits

Sarma, Loopamudra; Katoch, Sanjeet; Thakur, Y. P.; Sankhyan, Varun

doi:10.20546/ijcmas.2020.908.438

Cited by 2 publications

(4 citation statements)

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“…The effect of year of kindling was highly significant (P <0.01) on wool yield at I, III and IV clip and staple length, whereas non-significant on II clip wool yield and fiber diameter (Table 2). Similar to the present findings, the significant effect of year of kindling on wool yield was reported in German Angora rabbit (Sarma et al 2020) and in French Angora rabbits (Thebault et al 1992). The animals born during 2018 were found to have the highest performance and they differed significantly (P<0.01) with the values observed in other years.…”

Section: Effect Of Year Of Kindlingsupporting

confidence: 92%

“…The wool yield at I, II and III clip differed significantly among different seasons with the highest yield during winter season followed by autumn season. Similar significant seasonal effects on wool yield at different clips were reported by Sood et al (2007), Bhatt and Sharma (2009) and Sarma et al (2020) in German Angora rabbits. The growth before weaning would be more dependent on maternal effects and thus effect of season could be more important after weaning.…”

Section: Effect Of Season Of Kindlingsupporting

confidence: 87%

“…Significant effect of sex on wool yield was also reported by Sood et al (2007). However, non-significant effect of sex on wool yield was reported by Assad et al (2017) and Sarma et al (2020) in Angora rabbits.…”

Section: Effect Of Season Of Kindlingmentioning

confidence: 86%

“…It is much warmer (eight times) and lighter than sheep wool due to its hollow core (Pokharna et al 2004) and is being used either in pure or blended form throughout the world for making garments. Hence, the profitability of Angora rabbit farming largely depends on its growth and wool production performance and appears to be affected by a number of genetic as well as non-genetic factors (Thebault et al 1992, Niranjan et al 2010, Sarma et al 2020. The aid of selection tools largely depends on body weight, litter size at birth and weaning, wool yield and its quality.…”

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confidence: 99%

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Genetic studies on growth and production traits in German Angora Rabbits under sub-temperate climatic conditions

Rahim¹,

RAJARAVINDRA²,

CHATURVEDI³

et al. 2022

Indian J of Anim Sci

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This study aimed to assess the effect of genetic and non-genetic factors on growth, wool yield and wool characteristics of German Angora rabbit. Data was collected on 607 adult rabbits over a period of four years (2018-2021). The least squares means of body weights (g) at various ages, wool yield (g) at I, II, III and IV clip and wool characteristics assessed by staple length (cm) and fiber diameter (μ) were estimated. Sires of the rabbit progenies demonstrated highly significant effect (P<0.01) on the studied traits except wool characteristics. Sex of the rabbits had significant effect on body weight at 10th, 12th, 14th, 16th, 24th weeks of ages and wool yield at III clip, with greater estimates of females than the males for III clip, staple length, and 24th weeks body weight. Winter and autumn seasons were the most favourable seasons in comparison to summer season for estimated traits. Winter born kits had the highest body weights of 683±20.1, 961±24.3, 1263±27.5, 1484±34.0, 1735±37.1, 1942±40.1, 2136±36.9, 2232±36.7, 2341±37.4 and 2429±37.4 g and the summer born kits had the lowest body weights of 588±22.0, 820±27.2, 1037±31.2, 1307±38.0, 1515.79±41.0, 1696±44.1, 1847±41.4, 1920±41.0, 2034±42.4 and 2139±41.6 g, at biweekly interval from 6th to 24th, respectively. Rabbits with litter size less than six performed better in comparison to other groups for all growth traits and wool yield at I and III clip. The heritability estimates were found positive and high in magnitude for all growth traits, moderate for wool clip at different clips and very low for staple length. Genetic and phenotypic correlations were found to be very high and significant among growth traits and low to moderate among wool traits. The study revealed scope for further improvement in growth and wool yield by adopting selective breeding in the colony.

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Section: Effect Of Year Of Kindlingsupporting

confidence: 92%

Section: Effect Of Season Of Kindlingsupporting

confidence: 87%

Section: Effect Of Season Of Kindlingmentioning

confidence: 86%

mentioning

confidence: 99%

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Genetic studies on growth and production traits in German Angora Rabbits under sub-temperate climatic conditions

Rahim¹,

RAJARAVINDRA²,

CHATURVEDI³

et al. 2022

Indian J of Anim Sci

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Evaluating animal models comprising additive genetic and maternal effects on growth traits in German Angora rabbit

Rahim,

Rajaravindra,

Chaudhary

et al. 2024

World Rabbit Sci.

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This investigation was carried out to estimate the genetic parameters for German Angora rabbits using most appropriate animal model comprising additive and maternal effects. The pedigree information and data on growth traits were collected from 5221 rabbits, which descended from 699 does and 294 bucks over a period of 21 yr (2001–2021) kept at Northern Temperate Regional Station, Garsa, Kullu (Himachal Pradesh), India. The average daily gain (ADG) and Kleiber ratio (KR) were calculated at different age intervals. Analyses were carried out by restricted maximum likelihood procedure fitting six animal models with various combinations of direct and maternal effects. The best model was evaluated on the basis of a likelihood ratio test. Analysis revealed that the model including both direct and maternal genetic effects along with permanent effect of the dam was most suitable for all traits except for body weight (BW) at 6th wk of age, ADG from 6th to 12th wk of age and KR associated to ADG from 12th to 18th wk of age. The direct heritability estimates from the best model were ranged from, 0.34±0.05 to 0.49±0.05 for BW; 0.19±0.04, to 0.46±0.06 for ADG and 0.21±0.04 to 0.41±0.05 for KR, respectively. Direct heritability estimates were overestimated when maternal effects were ignored. Maternal effects on BW declined from 0.49±0.04 at weaning to 0.06±0.03 at 12th wk of age and 0.09±0.04 at 18th wk of age. Correlations between direct and maternal effects ranged from −0.44±0.15 to−0.52±0.14 for body weights, indicating biological antagonism between these effects. Genetic correlations among various growth traits were positive and high, indicating scope for correlated response in later expressed traits. Analysis revealed that maternal additive influences were only important until weaning, whereas permanent environmental maternal influences were present in all growth traits considered in this study. The moderate estimates of heritability for growth traits and Kleiber ratio of rabbit in this study indicate that rates of genetic progress may be possible for these traits by selection under the standard management system.

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Estimation of Genetic Parameters and Influence of Non Genetic Factors on Wool Yields in German Angora Rabbits

Cited by 2 publications

References 10 publications

Genetic studies on growth and production traits in German Angora Rabbits under sub-temperate climatic conditions

Genetic studies on growth and production traits in German Angora Rabbits under sub-temperate climatic conditions

Evaluating animal models comprising additive genetic and maternal effects on growth traits in German Angora rabbit

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