Grassland performance of Hereford cattle selected for rate and efficiency of lean gain on a concentrate diet

Bishop, Stephen

doi:10.1017/s0003356100006346

Cited by 4 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…heat and tick infestation) environments than Bos taurus cattle, as indicated by Vercoe & Frisch (1992). This is supported by Bishop (1993) when concluding that where environments differ sufficiently to make adaptation to environmental stresses necessary, genotype by environment interaction may be sufficiently important to consider when undertaking genetic improvement. However, it is not clear why HYSxS interactions are not significant for WW and FW.…”

Section: Resultsmentioning

confidence: 83%

Genetic parameters for growth traits in South African Limousin cattle

Niekerk¹,

Neser²

2007

SA J. An. Sci.

View full text Add to dashboard Cite

Accurate genetic parameters are vital for genetic prediction, selection on breeding values and creation of selection objectives. Consequently, records for birth weight (BW), 200 (WW), 400 (YW) and 600 (FW) day weight were analyzed to obtain heritability estimates. These records originated from Limousin herds with performance data on the South African Limousin Cattle Breeders' Society's database for the period 1980 to 2006. The dataset consisted of 26533 BW, 9756 WW, 6558 YW and 3329 FW records. Log likelihood ratio tests were used to indicate the most suitable model for each trait. Models tested included a herd-year-season by sire interaction (HYSxS) and permanent maternal environmental effect as additional random factors. Single trait analyses yielded direct heritability estimates of 0.09 and 0.19 for BW and WW, respectively while corresponding maternal heritability estimates were 0.05 and 0.12. A strong negative association was found between direct and maternal effects with a genetic correlation of -0.64 and -0.70 for BW and WW, respectively. Direct heritability estimates for YW and FW were 0.16 and 0.24, respectively. Direct genetic correlations of BW with YW and FW were 0.37 and 0.33, respectively. Direct genetic correlations of WW with YW and FW were 0.99 and 0.93, respectively while the correlation between YW and FW was 0.92. Heritability estimates indicate that genetic progress of the above traits will be slower than might be envisaged by some authors, due to lower direct estimates. The strong negative relationship between direct and maternal effects needs to be deliberated when defining selection objectives.

show abstract

Section: Resultsmentioning

confidence: 83%

Genetic parameters for growth traits in South African Limousin cattle

Niekerk¹,

Neser²

2007

SA J. An. Sci.

View full text Add to dashboard Cite

show abstract

Genotype × environment interactions for early growth and ultrasonic measurements in hill sheep

Bishop

Conington

Waterhouse³

et al. 1996

Anim. Sci.

Self Cite

View full text Add to dashboard Cite

Genotype X environment and genotype Xsex interactions were investigated using lines of Scottish Blackface sheep that had been divergently selected under intensive husbandry conditions for predicted carcass lean proportion, and offspring of rams from these selection lines which were reared under extensive hill conditions. Traits considered were live weight and ultrasonic fat and muscle depth. These were measured at 20 weeks of age on the intensively reared lambs and at 17 weeks of age on the extensively reared animals. Heritabilities for the two environments were 0-39 and 0-20 for fat depth, 0-36 and 0-25 for muscle depth and 0-23 and 0-12 for live weight. Genetic correlations between the environments were 0-54 (s.e. 0-17), 0-90 (s.e. 0-14) and 0-11 (s.e. 0-43) for fat depth, muscle depth and live weight, respectively. The extensive environment may be subdivided according to whether the lambs are reared on improved pasture or on the hill side. The genetic correlations (with s.e.s where estimable) between performance in these two environments were 0-70 (s.e. 0-33), 0-71 (s.e. 0-23) and 1-00 for fat depth, muscle depth and live weight. Genetic correlations between male and female performance under extensive conditions were 0-84 (s.e. 0-28), 0-99 (s.e. 0-14) and 1-00 for fat depth, muscle depth and live weight. T-or fat depth, the genetic correlations of the intensively reared lambs (males only) with extensively reared females and males were 0-37 (s.e. 0-22) and 0-67 (s.e. 0-17), respectively.

show abstract

Investigation of genotype × production environment interaction for weaning weight in the Santa Gertrudis breed in Australia

Bradfield¹,

Graser²,

Johnston³

1997

Aust. J. Agric. Res.

View full text Add to dashboard Cite

Weaning weight records of 12 563 Santa Gertrudis calves were used to estimate (co)variance components using a bivariate restricted maximum likelihood analysis. The analysis considered measurements on animals born in favourable production environments as Trait 1 and animals born in unfavourable production environments as Trait 2. Estimates of variance components for weaning weight across production environments were similar in magnitude. An additive genetic correlation of 0·64 between production environments was significantly different from unity, suggesting that there was a genotype production environment interaction. However, when a sire contemporary group interaction effect was included in the model, the genetic correlation between Trait 1 and Trait 2 was not significantly different from unity. These results suggest that the ranking of Santa Gertrudis sires across production environments was caused by changes in ranking from one contemporary group to the next rather than changes in ranking across production environments.

show abstract

Grassland performance of Hereford cattle selected for rate and efficiency of lean gain on a concentrate diet

Cited by 4 publications

References 19 publications

Genetic parameters for growth traits in South African Limousin cattle

Genetic parameters for growth traits in South African Limousin cattle

Genotype × environment interactions for early growth and ultrasonic measurements in hill sheep

Investigation of genotype × production environment interaction for weaning weight in the Santa Gertrudis breed in Australia

Contact Info

Product

Resources

About