Effect of inbreeding and individual increase in inbreeding on growth in Nilagiri and Sandyno breeds of sheep

Venkataramanan, R.; Subramanian, Arjunan; Sivaselvam, S.N.; Sivakumar, T.; Sreekumar, C.; Iyue, M.

doi:10.1017/s2078633615000338

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…Regression coefficients for DWG2 and DWG3 were higher than those (−0.263 ± 0.116) reported for daily weight gain from 90 to 365 in Sandyno sheep (4) , and lower than those found for daily weight gain from 90 to 180 (−1.810 ± 0.017) and from 90 to 365 (−1.345 ± 0.083) in Baluchi sheep (2) . Finding effect for daily weight gain and no effect for body weight seems incoherent, but it is easy to explain.…”

Section: Inbreeding Effect On Phenotype and Breeding Valuescontrasting

confidence: 70%

“…The effective population size (Ne) is a parameter widely used to indicate risk of inbreeding depression or even extinction risk. In the last 50 yr, the effective population size of several sheep breeds has drastically decreased, leading in some cases to inbreeding depression (2,3,4) . Moreover, several sheep breeds were extinct in the 20th century due to reduction of Ne.…”

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confidence: 99%

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Pedigree analysis of Santa Inês sheep and inbreeding effects on performance traits

Barbosa

Romano

Velarde

et al. 2020

Rev. Mex. Cienc. Pecu.

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Population parameters such as effective population size and coefficients of inbreeding are important information of a population but have rarely been studied in Santa Inês sheep. Therefore, this study aimed to estimate population parameters in a Santa Inês sheep flock and the inbreeding effect on performance traits. A dataset with 11,564 animals, born from 2003 to 2011, was recorded for weights at birth (BW1), 60 (BW60), 180 (BW180) and 270 (BW270) days of age, daily weight gain from birth to 60 d (DWG1), 60 to 180 d (DWG2), and 60 to 270 d (DWG3). Percentages of animals with known pedigrees decreased over generations, from 70 % in the first generation to less than 5 % in the third. The effective population size decreased from 665 in 2004 to 45 in 2010. The effective number founders and ancestors were 285 and 273, respectively. Furthermore, the average relatedness coefficient was 0.47 %. The highest frequency of inbred animals was concentrated between 0 and 10 % of the inbreeding coefficient and only 263 animals

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Section: Inbreeding Effect On Phenotype and Breeding Valuescontrasting

confidence: 70%

mentioning

confidence: 99%

Pedigree analysis of Santa Inês sheep and inbreeding effects on performance traits

Barbosa

Romano

Velarde

et al. 2020

Rev. Mex. Cienc. Pecu.

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“…Significant negative effect on 6, 9 and 12 months body weight was also observed by Dorostkar et al (2012) in Iranian Moghanisheep, Gowane et al (2014) in Malpura sheep, Naghavian et al (2016) in Shirva Kordi sheep and Venkataramanan et al (2016) in Nilagiri sheep. The significant deleterious effect of increased inbreeding was observed on all fitness traits in the present study.…”

Section: Effect Of Inbreeding On Growth and Fitness Traitssupporting

confidence: 52%

Effect of Inbreeding Coefficient on Growth and Fitness Traits in a Closed Flock of Corriedale Sheep

Nabi¹,

Ganai²,

Shanaz³

et al. 2021

IJAR

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Background: The corriedale sheep breed was imported into J and K during sixties for use in improvement of local sheep and are maintained at Mountain Research Station of Sheep and Goat, SKUAST- K. The animals over the years were allowed to mate within the selected animals of the flock as there was hardy any fresh importation of exotic animals from last 49 years due to which closed flock population was established within the farm. This has led to apprehensions over the loss of genetic diversity through years.Methods: The present study was to undertaken to evaluate the performance of Corriedale sheep under temperate climate and to estimate the inbreeding coefficient and its effect on growth and fitness traits of Corriedale sheep maintained at Mountain Research Centre for Sheep and Goat (MRCSG), F.V.Sc and A.H, SKUAST-K Shuhama, Kashmir. The information on performance and pedigree spanning over a period of 49 years (1969-2017) was collected and utilized for the study. The traits studied were birth weight (BW), weaning weight (WW), 6 months weight (6MW), 9 months weight (9MW) and 12 months weight (12MW) age at first lambing (AFL), litter size (LS), total lambs born per ewe (TLB) and survival rate (SR). Result: The averages estimates for BW, WW, 6MW, 9MW, 12MW, AFL, LS, TLB and SR were 3.72±0.01 kg, 13.31±0.07 kg, 18.65±0.05kg, 22.15±0.04 kg, 25.84±0.06 kg 807.20±4.34 days, 1.08±0.00, 4.83±0.03 and 80.76±1.98, respectively. The overall inbreeding coefficient (F) and proportion of population inbred (per cent) for Corriedale sheep were 18.3 and 43.3, respectively. The increased inbreeding coefficient had negative impact and highly significant (p less than 0.01) on all the traits under study except LS. The increased inbreeding coefficient (F) also had a negative impact on all the traits under study. With increase in the level of inbreeding there was a decrease in total body weight traits, lambs born per ewe and survival rate where as age at first lambing was increasing with the increase. he results indicated as decrease of 0.25 kg, 1.45 kg, 5.04 kg, 5.53 kg and 5.48 kg in body weight of the animals at birth, weaning weight, six months, nine months and twelve months from 1969-2017. To overcome the negative impact of inbreeding coefficient in the flock introduction of genetic variability through importation of Corriedale germplasm into the farm is highly recommended.

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“…Inbreeding depression, the decline in the value of a trait as a direct consequence of inbreeding, occurs in animal and plant populations. There was clear and irrefutable evidence for inbreeding depression in population [38,39]. The genetic studies and molecular evolutionary approaches suggested that inbreeding depression was predominantly caused by the presence of recessive deleterious mutations in populations [40].…”

Section: Discussionmentioning

confidence: 99%

Effects of Inbreeding on Genetic Characteristic, Growth, Survival Rates, and Immune Responses of a New Inbred Line of Exopalaemon carinicauda

Wang

et al. 2020

International Journal of Genomics

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The Exopalaemon carinicauda could be a useful crustacean laboratory animal in many research fields. We newly established an inbred line of Exopalaemon carinicauda named EC4 inbred line by brother×sister mating and keeping to F11 generation. Trends in heterozygosity in the process of producing EC4 inbred line were examined through the characterization of polymorphisms based on gene frequencies of SNP and EST-SSR loci. The results demonstrated that the number of alleles (N), observed heterozygosity (Ho), expected heterozygosity (He), and polymorphism information content (PIC) gradually decreased with the increase of inbreeding generations. The genetic detection results indicated that 9 (29.03%, 9/31) of the SNP loci and 15 (32.61%, 15/46) of the EST-SSR loci were homozygous in F11 generation of EC4 inbred line. The variation of the growth-related traits, the immune responses, and antioxidant status were described in experimental full-sibling inbred populations of E. carinicauda at five levels of inbreeding coefficient (F=0.785, F=0.816, F=0.859, F=0.886, F=0.908) under controlled laboratory conditions. The body weight, body length, and survival rate in EC4 inbred line of all generations were less than the control population. Inbreeding affected the antibacterial activity, phenoloxidase (PO) activity, and superoxide dismutase (SOD) which decreased at the eleventh generation of EC4 inbred line. This study demonstrated that inbreeding had a negative effect on the economic traits and immune response, but our inbred line was established successfully until F11 and confirmed by genetic detection using SNP and EST-SSR loci.

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Effect of inbreeding and individual increase in inbreeding on growth in Nilagiri and Sandyno breeds of sheep

Cited by 8 publications

References 22 publications

Pedigree analysis of Santa Inês sheep and inbreeding effects on performance traits

Pedigree analysis of Santa Inês sheep and inbreeding effects on performance traits

Effect of Inbreeding Coefficient on Growth and Fitness Traits in a Closed Flock of Corriedale Sheep

Effects of Inbreeding on Genetic Characteristic, Growth, Survival Rates, and Immune Responses of a New Inbred Line of Exopalaemon carinicauda

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