Parameters Contributing to Improved Reproductive Performance at Farrow-to-Finish Swine Farms in Japan

Yamane, Ichirō; Ishizeki, Sayoko; Yamazaki, Hisanori

doi:10.12935/jvma.67.177

Cited by 2 publications

(5 citation statements)

References 9 publications

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“…The gestation period in MMPs was comparable with those in other pig breeds [18,32,33]. Litter sizes at birth and weaning in MMPs were smaller than those in domestic pigs; 10.6 in commercial mixed breed pig herds in Japanese farm [34], 11.05 ± 0.77 (SD) in mixed breed domestic pigs in Japan [35], and 8.0—8.4 in Iberian pigs [36]. On the other hand, the litter size at birth in Göttingen minipigs was 5 to 6 piglets, which was slightly larger than that in MMPs [37].…”

Section: Resultsmentioning

confidence: 83%

“…To improve reproduction performances using genetic marker-assisted selection, reproductive traits, such as gestation periods and litter sizes have been analyzed in the pig populations of various breeds, including the MMPs with the extra small body sizes [31,32,33,34,35,36,37,38]. In comparing reproductive performances between the MMPs and other breeds of pigs [18,31,32,33,34,35,36,37,38], the mean gestation period, and litter sizes at birth and weaning in MMPs (Table 2) were similar to those of other breeds of domestic pigs [18,31,32], including Göttingen and NIBS minipigs [37,38]. Thus, the inbred MMP population, used in the present study, showed relatively normal reproductive traits that were useful and easier for evaluating the differential effects of SLA homozygous and heterozygous haplotypes on reproductive traits, than by using the more confounding SLA heterozygous haplotypes of most other breeds.…”

Section: Discussionmentioning

confidence: 99%

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Genetic Association between Swine Leukocyte antigen Class II Haplotypes and Reproduction Traits in Microminipigs

Andõ

Imaeda

Matsubara

et al. 2019

Cells

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The effects of swine leukocyte antigen (SLA) molecules on numerous production and reproduction performance traits have been mainly reported as associations with specific SLA haplotypes that were assigned using serological typing methods. In this study, we intended to clarify the association between SLA class II genes and reproductive traits in a highly inbred population of 187 Microminipigs (MMP), that have eight different types of SLA class II haplotypes. In doing so, we compared the reproductive performances, such as fertility index, gestation period, litter size, and number of stillbirth among SLA class II low resolution haplotypes (Lrs) that were assigned by a polymerase chain reaction-sequence specific primers (PCR-SSP) typing method. Only low resolution haplotypes were used in this study because the eight SLA class II high-resolution haplotypes had been assigned to the 14 parents or the progenitors of the highly inbred MMP herd in a previous publication. The fertility index of dams with Lr-0.13 was significantly lower than that of dams with Lr-0.16, Lr-0.17, Lr-0.18, or Lr-0.37. Dams with Lr-0.23 had significantly smaller litter size at birth than those with Lr-0.17, Lr-0.18, or Lr-0.37. Furthermore, litter size at weaning of dams with Lr-0.23 was also significantly smaller than those dams with Lr-0.16, Lr-0.17, Lr-0.18, or Lr-0.37. The small litter size of dams with Lr-0.23 correlated with the smaller body sizes of these MMPs. These results suggest that SLA class II haplotypes are useful differential genetic markers for further haplotypic and epistatic studies of reproductive traits, selective breeding programs, and improvements in the production and reproduction performances of MMPs.

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Section: Resultsmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Genetic Association between Swine Leukocyte antigen Class II Haplotypes and Reproduction Traits in Microminipigs

Andõ

Imaeda

Matsubara

et al. 2019

Cells

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“…Consequently, improved PWL was first accomplished after 2015 owing to the reduced PRWM because the PBA improved continuously during study period. A previous report using the same data collection system demonstrated a positive correlation between PBA and PRWM, indicating that increased PBA due to the introduction of highly prolific sows may not contribute to a higher PWL [28]. In other word, high proportion of piglets borne from these sows were not weaned properly.…”

Section: Discussionmentioning

confidence: 76%

“…Koketsu et al [16] found mean PWMFYs of 22.2, 23.4 and 21.7 in the USA, Canada and Japan, respectively, in 2007. Other reports [1,28] found much higher mean PWMFYs in EU than in Japan (23.0). Denmark, Spain, and the EU reported PWMFYs of 28.1, 24.0, and 24.4, respectively, in 2010.…”

Section: Introductionmentioning

confidence: 70%

“…Similar studies in other countries found that the mean PBA increased by 0.24 annually from 2013 to 2018 in the UK [2] and by 0.27 from 2012 to 2018 in Catalonia, Spain [5], demonstrating a similar increasing trend as that in the present study. The rapid increase in PBA during the study period was likely due to the introduction of highly prolific sows from the EU, which began around 2008 [28]. Previous studies in Japan [10,26] found that farms that introduced highly prolific sows from foreign companies had higher PBAs than did farms from domestic companies.…”

Section: Discussionmentioning

confidence: 88%

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Productivity analysis of 70 farrow-to-finish swine farms in Japan from 2013 to 2018

Ogura

Yamazaki

Kure

et al. 2022

The Journal of Veterinary Medical Science

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Improving productivity is an urgent issue in the swine industry if it is to compete internationally. However, lack of data about recent productivity transition obstructs stakeholder planning. This study investigated the yearly productivity trends among farrow-tofinish swine farms in Japan using annual productivity data from 2013-2018 obtained for 70 farms in Japan. The productivity parameters analyzed were pigs born alive per litter (PBA), preweaning mortality (PRWM), pigs weaned per litter (PWL), litters per mated female per year (LMFY), pigs weaned per mated female per year (PWMFY), post-weaning mortality (POWM) and marketed pigs per mated female per year (MP). Data were classified into three groups based on the size of the average female inventory and compared among groups. Results presented the mean PBA increased continuously over the 6-year period (P < 0.001), and the PWL, PWMFY, and MP means began increasing after 2015 (P < 0.001). These upward trends were particularly remarkable on large farms. The mean PRWM increased sharply in 2014, thus inhibiting the increases in PWL, PWMFY, and MP for the same year. The LMFY and POWM means did not change during the study period. Altogether, productivity in Japan improved markedly during the study period, indicating highly prolific sows were well utilized with suitable breeding techniques among farmers these days. Continued genetic improvement and sow management would aid further development in Japan.

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Parameters Contributing to Improved Reproductive Performance at Farrow-to-Finish Swine Farms in Japan

Cited by 2 publications

References 9 publications

Genetic Association between Swine Leukocyte antigen Class II Haplotypes and Reproduction Traits in Microminipigs

Genetic Association between Swine Leukocyte antigen Class II Haplotypes and Reproduction Traits in Microminipigs

Productivity analysis of 70 farrow-to-finish swine farms in Japan from 2013 to 2018

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