The Outcomes of Selection in a Closed Herd on a Farm in Operation

Do, Chang-Hee; Yang, ChangBeom; jae-gwan, choi; Kim, Si-Dong; Yang, Bo-Seok; Park, SooBong; Joo, YoungGuk; Lee, SeokHyun

doi:10.5713/ajas.14.0962

Cited by 3 publications

(3 citation statements)

References 27 publications

(29 reference statements)

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“…In many species, inbreeding was found to affect their lifetime performance (Yadav et al, 2019). Thus, minimizing the increase of inbreeding in the population is crucial from an economic point of view (Do et al, 2015). Usually, inbreeding depression can be reduced in a population by minimizing inbreeding or mean kinship based on pedigree information or genomic information when available (Hedrick & Garcia‐Dorado, 2016; Kardos et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Inbreeding depression and its effect on sperm quality traits in Pietrain pigs

Tsheten,

Fuerst‐Waltl,

Pfeiffer

et al. 2023

J Animal Breeding Genetics

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In most cases, inbreeding is expected to have unfavourable effects on traits in livestock. The consequences of inbreeding depression could be substantial, primarily in reproductive and sperm quality traits, and thus lead to decreased fertility. Therefore, the objectives of this study were (i) to compute inbreeding coefficients using pedigree (FPED) and genomic data based on runs of homozygosity (ROH) in the genome (FROH) of Austrian Pietrain pigs, and (ii) to assess inbreeding depression on four sperm quality traits. In total, 74,734 ejaculate records from 1034 Pietrain boars were used for inbreeding depression analyses. Traits were regressed on inbreeding coefficients using repeatability animal models. Pedigree‐based inbreeding coefficients were lower than ROH‐based inbreeding values. The correlations between pedigree and ROH‐based inbreeding coefficients ranged from 0.186 to 0.357. Pedigree‐based inbreeding affected only sperm motility while ROH‐based inbreeding affected semen volume, number of spermatozoa, and motility. For example, a 1% increase in pedigree inbreeding considering 10 ancestor generations (FPED10) was significantly (p < 0.05) associated with a 0.231% decrease in sperm motility. Almost all estimated effects of inbreeding on the traits studied were unfavourable. It is advisable to properly manage the level of inbreeding to avoid high inbreeding depression in the future. Further, analysis of effects of inbreeding depression for other traits, including growth and litter size for the Austrian Pietrain population is strongly advised.

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Section: Resultsmentioning

confidence: 99%

Inbreeding depression and its effect on sperm quality traits in Pietrain pigs

Tsheten,

Fuerst‐Waltl,

Pfeiffer

et al. 2023

J Animal Breeding Genetics

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“…On an average 10 per cent inbreeding in both the litter and dam was found to reduce survival in embryos up to day 25 and total pigs born alive (Rothschild, 1996). Depressive effect in fertility traits reported even in minimum inbreeding co-efficient by Belic et al, (2002) and Chang Hee Do et al, (2015), in which the population of inbred sows under their study was low and the population was a closed herd for long years without formation of new animals. Kumari et al (2005) in indigenous pigs maintained at Tirupati, reported that the inbreeding had no adverse effect on productive and reproductive traits even at levels of 5.83 per cent, which was also in agreement with the present study.…”

Section: Effect Of Inbreedingmentioning

confidence: 91%

Effect of inbreeding on pre-weaning and sow performance traits in Large White Yorkshire pigs

Gowrimanokari

Thiagarajan

Venkataramanan

et al. 2018

IJAR

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The present study was undertaken to study the effect of inbreeding on pre-weaning and sow performance traits of Large White Yorkshire pig population. Data on 7596 Large White Yorkshire pigs maintained at PGRIAS, Kattupakkam from the period of 1990 to 2015, were subjected to least square analysis to study the effect of inbreeding and other non-genetic factors viz., period, season, sex, parity, litter size at birth on various traits using general linear model. Inbreeding was calculated as Wright’s path co-efficient. The mean inbreeding co-efficient of LWY population studied was 2.45 %. Among 7596 animals in the pedigree, 2088 were inbred and the range of individual inbreeding co-efficient (F) was from 0 to 37.5 per cent. The average inbreeding in the inbred population was 8.92 %. The effect of inbreeding was found to be significant for weaning weight, pre-weaning average daily gain and litter weight at weaning, where the traits were found to increase with inbreeding (enhancement). The absence of depressive effect on fitness traits observed in the present study could be due to lower levels of inbreeding, which was possible due to periodic introduction of breeding animals and planned mating.

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“…However, increased inbreeding is an inevitable consequence of genetic selection in livestock populations [6]. Inbreeding induces impaired performance traits (inbreeding depression) and reduced genetic variation and therefore, is an important factor to consider in animal breeding practices [7][8][9]. Inbreeding is usually estimated from the pedigree information of the animal populations.…”

Section: Introductionmentioning

confidence: 99%

Genome-wide scan for runs of homozygosity identifies candidate genes in Wannan Black pigs

et al. 2021

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Objective：Runs of homozygosity (ROH) are contiguous lengths of homozygous genotypes that can reveal inbreeding levels, selection pressure, and mating schemes. In this study, ROHs were evaluated in Wannan Black pigs to assess the inbreeding levels and the genome regions with high ROH frequency. Methods: In a previous study, we obtained 501.52 g of raw data from resequencing (10×) of the genome and identified 21,316,754 single-nucleotide variants (SNVs) in 20 Wannan Black pig samples. We investigated the number, length, and frequency of ROH using resequencing data to characterize the homozygosity in Wannan Black pigs and identified genomic regions with high ROH frequencies. Results: In this work, 1,813 ROHs (837 ROHs in 100-500 kb, 449 ROHs in 500-1,000 kb, 527 ROHs in >1,000 kb) were identified in all samples, and the average genomic inbreeding coefficient (F ROH) in Wannan Black pigs was 0.5234. Sixty-one regions on chromosomes 2, 3, 7, 8, 13, 15, and 16 harbored ROH islands. In total, 105 genes were identified in 42 ROH islands, among which some genes were related to production traits. Conclusion: This is the first study to identify ROH across the genome of Wannan Black pigs, the Chinese native breed of the Anhui province. Overall, Wannan Black pigs have high levels of inbreeding due to the influence of ancient and recent inbreeding on the genome. These findings are a reliable resource for future studies A c c e p t e d A r t i c l e 4 and contribute to save and use the germplasm resources of Wannan Black pigs.

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The Outcomes of Selection in a Closed Herd on a Farm in Operation

Cited by 3 publications

References 27 publications

Inbreeding depression and its effect on sperm quality traits in Pietrain pigs

Inbreeding depression and its effect on sperm quality traits in Pietrain pigs

Effect of inbreeding on pre-weaning and sow performance traits in Large White Yorkshire pigs

Genome-wide scan for runs of homozygosity identifies candidate genes in Wannan Black pigs

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