Effects of Mild Inbreeding on Productive and Reproductive Performance of Guernsey Cattle

Hermas, S.; Young, Charles W.; Rust, J. W.

doi:10.3168/jds.s0022-0302(87)80062-0

Cited by 39 publications

(22 citation statements)

References 8 publications

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“…Inbreeding depression has been evaluated and confirmed in small cattle populations (12,13) as well as in breeds with large worldwide numerical distribution. The influence of inbreeding depression has been confirmed mainly on traditional traits, such as length of service period (14)(15)(16), number of services and conception rate (14), and length of the first calving interval (17). Alvarez et al (18) determined a lower number of transferable embryos in cows with F X = 9.0%-30.0% compared to those with F X = 0%-8.9% (P < 0.05).…”

Section: Introductionmentioning

confidence: 98%

Effect of inbreeding on yield and quality of embryos recovered from superovulated Holstein cows

Bezdíček

Stádník²,

Makarevich³

et al. 2014

Turk J Vet Anim Sci

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The aim of this study was to evaluate the effect of inbreeding on the yield and quality of bovine embryos. The data were obtained from 125 Holstein cows superovulated on 3 farms in the Czech Republic. In total, 125 flushings of embryos were analyzed, from which 761 embryos were obtained. Of all donors, 36 cows were inbred (199 embryos) and 89 cows were noninbred (562 embryos). The inbred cows were divided into 2 groups according to their inbreeding coefficient (F X ) level. The low F X group (F X 1.26%-1.56%) had 23 cows and 147 embryos, and the high F X group (F X 3.1%-25%) was represented by 13 cows and 52 embryos. The average value of the F X coefficient in inbred cows was 6.552%. The data were subsequently analyzed using PROC GLM of SAS as descriptive statistics and t-tests (SAS/STAT ® 9. 1., 2009). All evaluated traits in inbred cows had worse results than noninbred cows. Although there were poorer results for inbred versus noninbred cows, the differences were not great at lower F X values and were not statistically significant. Important and significant differences (P ≤ 0.05) were found in the proportion of transferable embryos and unfertilized oocytes at higher rates of F X .

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Section: Introductionmentioning

confidence: 98%

Effect of inbreeding on yield and quality of embryos recovered from superovulated Holstein cows

Bezdíček

Stádník²,

Makarevich³

et al. 2014

Turk J Vet Anim Sci

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“…The Fx coefficient increasing by 1 % extends the pregnancy length by 0.063 day. HERMAS et al (1987), who mentioned increasing of service period by +1.4 day for 1% increasing of Fx. Anyway, also these authors evaluated increasing of service period for inbred animals as non-significant.…”

Section: Methodsmentioning

confidence: 99%

“…CASSELL et al (2003) found out in Holstein livestock in the USA that the F x increasing of 1 % extended service period of 0.15 d. However, this increase was evaluated as non-significant. HERMAS et al (1987) studied impacts of different inbreeding levels within the interval F x 0-25.3 % . This experiment was carried out in Guersey cattle.…”

Section: Introductionmentioning

confidence: 99%

The effects of inbreeding on service period and pregnancy length in Holsteins and Czech Fleckviehs after the first calving

et al. 2007

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The effects of inbreeding level on service period (SP) and pregnancy length (PL) were monitored in Holstein and Czech Fleckvieh after the first calving. The levels of inbreeding (F X ) ranged from 1.25 to 25 %. SP and PL of inbred cows were compared with their outbred equals -half-sisters, sharing the same sire (n = 1824) and their first calving happened in the same farm and at the same time (± 3 month). Database with the number of 631 810 animals (year of calving 1985-2004) was used for analyses. Inbred cows were grouped according to F x coefficient (1.5-2.3 %; 3.0-5.0 %; 8.0-12.5 %; 25 %). The GLM with fixed effects (the breed, breeding value of the sire and monitored individual for milk production, year of calving, age at first calving) was applied to all data. The effect of inbreeding depression on SP was more pronounced at higher levels of inbreeding (+2.81; +3.35; +4.53; +8.23 d, respectively according to above mentioned F x groups) but non-significant. Differences in PL (+0.3; +0.32; -0.08 and 1.68 d) were not significant either. Average value of PL for inbred animals was 0.43 d higher. The correlation coefficient was +0.023 for SP and +0.0658 for PL. The F x coefficient increasing by 1 % extends the SP by 0.22 day and PL by 0.063 day. There was a higher variability of SP and PL in inbred cows. The length of calving interval between the first and second lactation is affected more by SP than PL.

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“…The coefficient of inbreeding measures the percentage of genes of an individual that are identical by descent and, over the last 30 years, this coefficient has increased from about 1 to w5% in the Holstein breed. Estimates of the effects of inbreeding on reproduction indicate a detrimental effect on reproductive parameters such that every 1% increase in inbreeding led to 0.17 increase in service/conception, 2 days increase in the period from calving to conception (days open) and 3.3 percentage-unit decrease in conception rate (Hermas et al 1987). As a strategy to counterbalance the rise in inbreeding in dairy breeds, crossbreeding has been proposed as a possibility to increase productive and reproductive efficiency (McAllister 2002).…”

Section: Introductionmentioning

confidence: 99%

Embryonic genotype and inbreeding affect preimplantation development in cattle

Lazzari

Colleoni²,

Duchi³

et al. 2011

Reproduction

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Infertility in cattle herds is a growing problem with multifactorial causes. Embryonic genotype and level of inbreeding are among the many factors that can play a role on reproductive efficiency. To investigate this issue, we produced purebred and crossbred bovine embryos by in vitro techniques from Holstein oocytes and Holstein or Brown Swiss semen and analyzed several cellular and molecular features. In the first experiment, purebred and crossbred embryos, obtained from abattoir oocytes, were analyzed for cleavage, development to morula/blastocyst stages, amino acid metabolism and gene expression of developmentally important genes. The results indicated significant differences in the percentage of compacted morulae, in the expression of three genes at the blastocyst stage (MNSOD, GP130 and FGF4) and in the utilization of serine, asparagine, methionine and tryptophan in day 6 embryos. In the second experiment, bovine oocytes were collected by ovum pick up from ten Holstein donors and fertilized with the semen of the respective Holstein sires or with Brown Swiss semen. The derived embryos were grown in vitro up to day 7, and were then transferred to synchronized recipients and recovered on day 12. We found that purebred/inbred embryos had lower blastocyst rate on days 7-8, were smaller on day 12 and had lower expression of the trophoblast gene PLAC8. Overall, these results indicate reduced and delayed development of purebred embryos compared with crossbred embryos. In conclusion, this study provides evidence that embryo genotype and high inbreeding can affect amino acid metabolism, gene expression, preimplantation development and therefore fertility in cattle.

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Effects of Mild Inbreeding on Productive and Reproductive Performance of Guernsey Cattle

Cited by 39 publications

References 8 publications

Effect of inbreeding on yield and quality of embryos recovered from superovulated Holstein cows

Effect of inbreeding on yield and quality of embryos recovered from superovulated Holstein cows

The effects of inbreeding on service period and pregnancy length in Holsteins and Czech Fleckviehs after the first calving

Embryonic genotype and inbreeding affect preimplantation development in cattle

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