A retrospective study of female reproductive parameters in the Kunming dog

Wei, Yunfang; Wan, Jiu-Sheng; Chen, Fang-Liang; Chen, Chao; Li, Jing; Cheng, Lu-Guang; Mao, Ai-Guo; Li, Fei-Xiang; Wang, Bin; Huang, Qing-Guo; Tang, Shusheng; Wei, Hong‐Jiang

doi:10.1111/asj.12914

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…However, there are few data regarding factors that influence puppy relative growth rate. Although domestic dogs are considered non-seasonal breeders, seasonal effects on the reproductive performance of bitches remain contradictory (Wei et al 2018). Studies failed to demonstrate a season influence on litter size (Borge et al 2011;Wigham et al 2017), but, to the authors' knowledge, no influence on growth rate has been previously examined.…”

Section: Introductionmentioning

confidence: 83%

Puppy growth rate during early periods of labrador retriever development: role of litter size and photoperiod of birth

Alberghina

Gioè

Quartuccio

et al. 2021

Italian Journal of Animal Science

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Section: Introductionmentioning

confidence: 83%

Puppy growth rate during early periods of labrador retriever development: role of litter size and photoperiod of birth

Alberghina

Gioè

Quartuccio

et al. 2021

Italian Journal of Animal Science

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“…Inbreeding may affect many traits including birth weight [32] and litter size [33] in domestic animal species. In the present study, PBW was only marginally influenced by the inbreeding coefficient.…”

Section: Discussionmentioning

confidence: 99%

Heritabilities for the puppy weight at birth in Labrador retrievers

et al. 2019

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BackgroundWeight at birth is an important predictor of neonatal mortality and morbidity in dogs. In addition, the birthweight of the puppies in a litter influences the decision to perform a cesarean section. The goal of the present study was to estimate heritabilities for the puppy birth weight in Labrador retrievers.ResultsOf the 1138 Labrador retriever litters whelped at the Guiding Eye for the Blind between September 2001 and February 2018, 1013 were included in the analyses after data editing. Puppy weight at birth was the target trait, measured on a continuous scale in pounds, and converted to grams. Linear mixed models were used to identify factors influencing puppy weight at birth. The analyses showed that the sex of the puppy, litter size, length of gestation, adult weight of the dam, parity, year of birth and inbreeding coefficient of the puppies and dams contributed to the variance of the puppy birth weight. Dam and litter effects were included as random effects. A multiple trait derivative free restricted maximum likelihood approach was used to estimate variance components and genetic parameters with two animal models, one without covariates (Model 1) and one with covariates (Model 2). Sex of the puppy and litter size had moderate effects, whereas gestation length, adult weight of the dam, parity, year of birth and inbreeding coefficients of the dam and the puppies had minor effects. Estimates for Model 1 and Model 2 were 0.21 and 0.17 for the direct heritabilities, 0.22 and 0.22 for the maternal additive genetic heritabilities, 0.07 and 0.07 for the maternal permanent environmental proportions, and 0.14 and 0.08 for the environmental proportion of the litter.ConclusionsIn order to estimate reliable breeding values for puppy weight at birth, sex of puppy, litter size, length of gestation and the adult weight of the dam should be included. Estimates could benefit from weighing the dams prior to each mating.

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“…Dogs have unique reproductive characteristics compared with other mammals. They are non-seasonal and monoestrus animals, and their estrus interval is longer than that of other animals [ 5 ]. It has also been reported that oocytes ovulate in the metaphase I stage and mature into the metaphase II stage in the fallopian tube, and that there is heterogeneity in oocyte maturation in dogs [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of co-transfer of embryos produced by somatic cell nuclear transfer using two types of donor cells on pregnancy outcomes in dogs

Son

Jeong

et al. 2022

Anim Biosci

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Objective: The present study analyzed the influence of co-transferring embryos with high and low cloning efficiencies produced via somatic cell nuclear transfer (SCNT) on pregnancy outcomes in dogs.Methods: Cloned dogs were produced by SCNT using donor cells derived from a Tibetan Mastiff (TM) and Toy Poodle (TP). The in vivo developmental capacity of cloned embryos was evaluated. The pregnancy and parturition rates were determined following single transfer of 284 fused oocytes into 21 surrogates and co-transfer of 47 fused oocytes into four surrogates.Results: When cloned embryos produced using a single type of donor cell were transferred into surrogates, the pregnancy and live birth rates were significantly higher following transfer of embryos produced using TP donor cells than following transfer of embryos produced using TM donor cells. Next, pregnancy and live birth rates were compared following single and co-transfer of these cloned embryos. The pregnancy and live birth rates were similar upon co-transfer of embryos and single transfer of embryos produced using TP donor cells but were significantly lower upon single transfer of embryos produced using TM donor cells. Furthermore, the parturition rate for TM dogs and the percentage of these dogs that remained alive until weaning was significantly higher upon co-transfer than upon single transfer of embryos. However, there was no difference between the two embryo transfer methods for TP dogs. The mean birth weight of cloned TM dogs was significantly higher upon single transfer than upon co-transfer of embryos. However, the body weight of TM dogs did not significantly differ between the two embryo transfer methods after day 5.Conclusion: For cloned embryos with a lower developmental competence, the parturition rate and percentage of dogs that remain alive until weaning are increased when they are co-transferred with cloned embryos with a greater developmental competence.

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A retrospective study of female reproductive parameters in the Kunming dog

Cited by 9 publications

References 26 publications

Puppy growth rate during early periods of labrador retriever development: role of litter size and photoperiod of birth

Puppy growth rate during early periods of labrador retriever development: role of litter size and photoperiod of birth

Heritabilities for the puppy weight at birth in Labrador retrievers

Impact of co-transfer of embryos produced by somatic cell nuclear transfer using two types of donor cells on pregnancy outcomes in dogs

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