Linear and Curvilinear Effects of Inbreeding on Production Traits for Walloon Holstein Cows

Croquet, Coraline; Mayeres, Patrick; Gillon, Alain; Hammami, Hedi; Soyeurt, Hélène; Vanderick, Sylvie; Gengler, Nicolas

doi:10.3168/jds.s0022-0302(07)72648-6

Cited by 25 publications

(34 citation statements)

References 18 publications

(24 reference statements)

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“…Nevertheless, these authors evaluated both models and concluded that the former would be the best options to describe the effect of inbreeding on production traits. The results obtained with dairy Gyr cattle (Table 2) corroborate those presented by Croquet et al (2007). The positive and negative estimates of linear and quadratic effects of F, respectively, on milk 305-d, fat 305-d, and lactose 305-d in dairy Gyr cattle show that inbreeding depression tends to reduce with increase of F. Kristensen and Sorensen (2005) highlighted that the non-linearity of inbreeding depression would be difficult to interpret because there are different elements that are not directly related to inbreeding.…”

Section: Resultssupporting

confidence: 86%

“…It is important to highlight that only the linear effect of inbreeding was evaluated in these cited papers. According to Croquet et al (2007), few studies have tested linear and curvilinear regressions in real situations with large databases. Nevertheless, these authors evaluated both models and concluded that the former would be the best options to describe the effect of inbreeding on production traits.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies relate the increase of inbreeding in European breeds to the reduction of phenotypic means in traits of economic interest (Croquet et al, 2007;Gulisija et al, 2007), a phenomenon called inbreeding depression (Falconer and Mackay, 1996). Similar results were also observed in Bos indicus breeds, like Gyr (Queiroz et al, 1993) and Guzerat (Panetto et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Inbreeding on productive and reproductive traits of dairy Gyr cattle

et al. 2015

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-The objective of this study was to estimate genetic parameters and to evaluate the effects of inbreeding on productive and reproductive traits of dairy Gyr cattle. Single-trait animal models were used to estimate genetic parameters and solutions for inbreeding coefficients for milk (milk 305-d), fat (fat 305-d), protein (protein 305-d), lactose (lactose 305-d), and total solids (TS 305-d) yield up to 305 days of lactation, days in milk (DIM), age at first calving (AFC) and calving intervals (CI). The mean inbreeding coefficient was 2.82%. The models with linear and quadratic effects of inbreeding coefficients fitted the data better than the models without or with only linear effect of inbreeding coefficient for all traits. The increase in inbreeding coefficient caused several losses in productive and reproductive traits of dairy Gyr cattle. Estimates of heritability for milk DIM, AFC, and CI were 0.28, 0.27, 0.22, 0.21, 0.22, 0.17, 0.20, and 0.10, respectively. It is possible to achieve genetic progress in productive traits (especially in milk 305-d and fat 305-d) and age at first calving in dairy Gyr cattle through selection.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inbreeding on productive and reproductive traits of dairy Gyr cattle

et al. 2015

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“…Nevertheless, if epistatic effects are also involved in inbreeding depression, a non-linear decline in mean performance would result from accumulated inbreeding [6]. Evidence of a non-linear association between inbreeding and performance has been detected in several traits in dairy cattle [8,16,22,32,33], but to our knowledge it has not been documented for other livestock species.…”

mentioning

confidence: 90%

Inbreeding depression on beef cattle traits: Estimates, linearity of effects and heterogeneity among sire-families

Carolino¹,

Gama²

2008

Genet Sel Evol

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-Records from up to 19 054 registered cows and 10 297 calves in 155 herds of the Alentejana cattle breed were used to study the effects of individual (F i ) and maternal (F m ) inbreeding on reproductive, growth and carcass traits, as well as assessing the importance of non-linear associations between inbreeding and performance, and evaluating the differences among sire-families in the effect of F i and F m on calf weight at 7 months of age (W7M). Overall, regression coefficients of performance traits on inbreeding were small, indicating a minor but still detrimental effect of both F i and F m on most traits. The traits with the highest percentage impact of F i were total number of calvings through life and calf weight at 3 months of age (W3M), followed by longevity and number of calves produced up to 7 years, while the highest effect of F m was on W3M. Inbreeding depression on feed efficiency and carcass traits was extremely small and not significant. No evidence was found of a non-linear association between inbreeding and performance for the traits analyzed. Large differences were detected among sire-families in inbreeding depression on W7M, for both F i and F m , encouraging the possibility of incorporating sire effects on inbreeding depression into selection decisions.Alentejana / cattle / inbreeding depression / individual inbreeding / maternal inbreeding

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“…This reduction in genetic diversity and its effects have been extensively studied in different species, particularly in beef cattle (Swiger et al, 1961;Burrow, 1998;Santana et al, 2010). One of the most relevant effects resulting from reduced genetic diversity is inbreeding depression, which compromises the performance of domestic animals (Croquet et al, 2007;González-Recio et al, 2007;Panetto et al, 2010).…”

Section: Introductionmentioning

confidence: 99%