The Effects of Inbreeding on the Lifetime Performance of Dairy Cattle

Smith, L.A.; Cassell, B.G.; Pearson, R.E.

doi:10.3168/jds.s0022-0302(98)75830-8

Cited by 167 publications

(185 citation statements)

References 19 publications

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“…The effect of inbreeding on CI in Alentejana was moderate (+0.263 d/1% F), but was in agreement with results obtained in dairy cattle, where estimated regression coefficients of CI on inbreeding range from +0.26 to +0.7 d [22,29]. Our estimate for the reduction in longevity with increased inbreeding was in line with, but lower than, the findings of different studies in Jersey [3] and Holstein [22,28,29,33] dairy cows.…”

Section: Discussionsupporting

confidence: 90%

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

Carolino¹,

Gama

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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Section: Discussionsupporting

confidence: 90%

“…Our estimate for the reduction in longevity with increased inbreeding was in line with, but lower than, the findings of different studies in Jersey [3] and Holstein [22,28,29,33] dairy cows.…”

Section: Discussionsupporting

confidence: 80%

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

Carolino¹,

Gama

2008

Genet. Sel. Evol.

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“…Du Toit et al (2012) also reported significant negative effects of inbreeding on functional herd life in the first and second lactations of SA Jersey cows. Smith et al (1998) observed that inbreeding decreased the mature equivalent production of milk, fat and protein during first lactation by 27, 0.9 and 0.8 kg, respectively, while the lifetime production of milk, fat and protein were reduced by 177, 6.0 and 5.5 kg, respectively, per 1% increase in inbreeding. A decreased survival rate of Jerseys has been observed as the level of inbreeding increased.…”

Section: Introductionmentioning

confidence: 93%

Reproductive performance of Jersey and Fleckvieh × Jersey heifers and cows maintained on a pasture-based feeding system

Goni¹,

Muller²,

Dube³

et al. 2015

SA J. An. Sci.

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Crossbreeding is regarded as a faster way than using pure dairy breeds to improve the reproductive performance of dairy cows, which is pivotal to farm income. The reproductive performances of Jersey and Fleckvieh × Jersey (F × J) heifers and cows were compared in a pasture-based production system. Heifers were inseminated when showing signs of heat from 13 months old and cows from 40 days post calving. Using insemination records and pregnancy check results, fertility traits were derived and compared between breeds, using analysis of variance for continuous records. Age at first insemination and conception age for heifers did not differ between the two breeds, resulting in a similar age at first calving. For cows, the mean (± SE) interval from calving to first insemination was shorter for F × J cows, being 76.7 ± 2.2 days compared with 82.4 ± 2.5 days for Jersey cows. A larger proportion of F × J cows were inseminated within 80 days post calving, compared with the Jersey cows (0.70 and 0.54, respectively). Furthermore, the proportion of cows confirmed pregnant by 100 days in milk was higher for F × J cows in comparison with Jersey cows, being 0.79 and 0.66, respectively. Although the absolute number of days between calving and conception (days open) was slightly less for F × J cows in comparison with Jersey cows (104.8 ± 6.8 and 114.8 ± 8.1 days, respectively), the difference was not significant. These results indicate the potential of improving reproductive performance of Jersey cows through crossbreeding with the dual-purpose Fleckvieh.

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“…For production traits, they range from −9.84 kg of milk to −29.6 kg of milk, from −0.55 kg of fat to −1.08 kg of fat, and from −0.80 kg of protein to −0.97 kg of protein (Casanova et al, 1992;Miglior et al, 1992Miglior et al, , 1995Wiggans et al, 1995;Smith et al, 1998) per 1% increase in inbreeding and for a lactation. Inbreeding may increase SCC (Miglior et al, 1995;Smith et al, 1998;Mrode et al, 2004); however, only a few studies tried to assess this. Miglior et al (1995) showed that inbred animals could be inclined to develop mastitis.…”

Section: Introductionmentioning

confidence: 99%

“…Miglior et al (1995) showed that inbred animals could be inclined to develop mastitis. The effects of inbreeding on type traits were seldom reported and generally considered weak (Misztal et al, 1997;Smith et al, 1998). Traits most affected by inbreeding are often connected with reproductive performance (Miglior, 1994;Smith et al, 1998;Cassell et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Inbreeding Depression for Global and Partial Economic Indexes, Production, Type, and Functional Traits

Croquet

Mayeres

Gillon

et al. 2006

Journal of Dairy Science

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The objective of this research was to examine the effects of inbreeding in the population of Holstein cattle in the Walloon region of Belgium. The effects of inbreeding on the global economic index and its components were studied by using data from the genetic evaluations of February 2004 for production, somatic cell score (SCS), computed from somatic cell counts and type. Inbreeding coefficients for 956,516 animals were computed using a method that allows assigning an inbreeding coefficient to individuals without known parents. These coefficients were equal to the mean inbreeding coefficient of contemporary individuals with known parents. The significance of inbreeding effects on the different evaluated traits and on the different indexes were tested using a t-test comparing estimated standard errors and effects. The inbreeding effect was significantly different from zero for the vast majority of evaluated traits and for all of the indexes. Inbreeding had the greatest deleterious effects on production traits. Inbreeding decreased yield of milk, fat, and protein during a lactation by 19.68, 0.96, and 0.69 kg, respectively, per each 1% increase in inbreeding. The regression coefficient of SCS per 1% increase in inbreeding was +0.005 SCS units. The inbreeding depression was thus relatively low for SCS, but inbred animals had higher SCS than non-inbred animals, indicating that inbred animals would be slightly more sensitive to mastitis than non-inbred animals. Estimates of inbreeding effects on evaluated type traits per 1% increase were small. The most strongly affected type traits were chest width, rear leg, and overall development on a standardized scale. For several type traits, particularly traits linked to the udder, the estimates suggested a favorable effect of inbreeding. The global economic index was depressed by around 6.13 € of lifetime profit per 1% increase in inbreeding for the Holstein animals in the Walloon region of Belgium.

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The Effects of Inbreeding on the Lifetime Performance of Dairy Cattle

Cited by 167 publications

References 19 publications

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

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

Reproductive performance of Jersey and Fleckvieh × Jersey heifers and cows maintained on a pasture-based feeding system

Inbreeding Depression for Global and Partial Economic Indexes, Production, Type, and Functional Traits

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