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Performance evaluation of Marwari lambs for growth traits and impact of inbreeding

Published online by Cambridge University Press:  13 April 2023

Jayesh Vyas Open the ORCID record for Jayesh Vyas [Opens in a new window] ,
Urmila Pannu ,
Ram Kumar Saran ,
H.K. Narula ,
Ashish Chopra  and
G.R. Gowane
Jayesh Vyas*
Affiliation:
Department of Animal Genetics and Breeding, College of Veterinary and Animal Science, Bikaner, Rajasthan, 334001, India
Urmila Pannu
Affiliation:
Department of Animal Genetics and Breeding, College of Veterinary and Animal Science, Bikaner, Rajasthan, 334001, India
Ram Kumar Saran
Affiliation:
Department of Animal Genetics and Breeding, College of Veterinary and Animal Science, Bikaner, Rajasthan, 334001, India
H.K. Narula
Affiliation:
ICAR-Central Sheep & Wool Research Institute, Arid Region Campus, Bikaner, Rajasthan, 334001, India
Ashish Chopra
Affiliation:
ICAR-Central Sheep & Wool Research Institute, Arid Region Campus, Bikaner, Rajasthan, 334001, India
G.R. Gowane
Affiliation:
Animal Genetics & Breeding Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India
*
Author for correspondence: Jayesh Vyas. Department of Animal Genetics and Breeding, College of Veterinary and Animal Science, Bikaner, Rajasthan, 334001, India. E-mail: jayeshvyas04@gmail.com
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Summary

This study aimed at the performance evaluation of a closed flock of Marwari sheep and also to study the effect of accumulated inbreeding on the growth traits using a linear mixed model methodology. The data generated for 39 years (1981 to 2020) on Marwari sheep maintained at ICAR-Central Sheep & Wool Research Institute, Arid Region Campus (CSWRI, ARC), Bikaner, Rajasthan, India were used for analysis on growth traits. The overall least-squares means (LSM) of live weights at birth (BWT), weaning (3MWT), 6 months (6MWT), 9 months (9MWT) and 12 months (12MWT) were observed to be 3.02 ± 0.01, 14.30 ± 0.04, 20.12 ± 0.05, 23.68 ± 0.06 and 26.39 ± 0.07 kg, respectively. Overall LSM for average daily gain from birth to 3 months (ADG1), 3 to 6 months (ADG2) and 6 to 12 months (ADG3) were 125.44 ± 0.40, 67.37 ± 0.40 and 35.83 ± 0.29 g/day, respectively. Kleiber ratio (KR) from birth to 3 months (KR1), 3 to 6 months (KR2), and 6 to 12 months (KR3) were 16.78 ± 0.02, 6.58 ± 0.04 and 3.05 ± 0.02, respectively. Results revealed a 4.36, 25.83, 36.33, 31.50 and 28.99% improvement in the live weights since the inception of the improvement programme. This is also reflected by a significant effect of sire on all the growth traits. The estimate of inbreeding in the flock was 1.55%. Highly inbred animals were 5.13% (>5% Fi). The study revealed the non-significant effect of inbreeding level on all growth traits except for BWT and KR3. For BWT, inbreeding classes had variation; however, a negative effect was not seen. The inbreeding class (>5% Fi) was reduced by 0.05 units for KR3 as against its preceding class. Dam’s age at lambing and weight influenced the birth weight and subsequent weights. The study concluded that the selection programme of Marwari sheep is in the right direction; however, regular monitoring of inbreeding is necessary and factors affecting growth must be monitored to attain better growth rates in the nucleus.

Keywords

Average daily gainBody weightInbreedingKleiber ratioMarwari sheepMixed model equation
Type
Research Article
Information
Zygote , Volume 31 , Issue 3 , June 2023 , pp. 288 - 295
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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