Genotype (breed) and environment interaction with particular reference to cattle in the tropics - Review -

Vercoe, J. E.; Frisch, J. E.

doi:10.5713/ajas.1992.401

Cited by 18 publications

(21 citation statements)

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“…This indicates that there is no universally "best" genotype -the "best" genotype will differ from one environment to another and will depend on the prevalent environmental conditions (Verscoe & Frisch, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…To the scientist it presents the venture of fathoming whether genetic or environmental changes are the most efficient avenues through which productivity can be enhanced. G x E is more consequential in (Verscoe & Frisch, 1990). Stress, in its physical sense, cannot easily be measured in a biological system, but particular exhibitions of stress, such as changes in body temperature, heart rate and respiration can be measured because the animal responds functionally to uphold homeostasis (Du Preez, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Effect of heat stress on six beef breeds in the Zastron district: The significance of breed, coat colour and coat type

2010

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A study was done to determine which factors had the greatest influence on a heifer's susceptibility to heat stress. Parameters tested were breed, coat colour, coat score, hide thickness, weight gain, respiration rate and body condition score. The study was conducted in the southeastern Free State. Afrikaner, Bonsmara, Braford, Charolais, Drakensberger and Simmentaler heifers were subjected to a heat tolerance trial. A total of 60 heifers, 10 of each breed were evaluated. Rectal temperature (T re ) was used as a parameter to determine heat stress. The heifers were evaluated on 10 days, at 14:00 during the winter of 2007 and on seventeen days, at 14:00 during the summer of 2007/8 (after 1 h in the sun, no access to shade). In winter a significant difference in rectal temperature T re between breeds was measured on seven occasions. Phenotypical factors tested for did not affect T re in winter. In summer significant differences in T re were measured on 12 occasions between breeds. The following factors had a significant influence on T re in the following breeds: Afrikanerhide thickness, Bonsmara -hide thickness, Charolais -coat score.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of heat stress on six beef breeds in the Zastron district: The significance of breed, coat colour and coat type

2010

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“…Robertson (1959) suggests that if the genetic correlation between environments is less than 0.80, the genotype×environment interaction is of biological importance. Vercoe and Frisch (1992) concluded that a G×E of small magnitude can only occur when genotypes with similar configurations of production potential and resistance to stress are compared, no matter how different the environments may be. In this study, genetic correlations between the weights in the two herds tended to decrease with the age (from 0.74 at 3 months of age to 0.57 at 24 months).…”

Section: Estimates Of G×e For Growth Traitsmentioning

confidence: 99%

“…The G×E means simply that the effect of the environment on different breeds or genotypes is not the same; this implies that there is no universally "Best" genotype; the best genotype will vary from one environment to another and will depend on the prevailing environment conditions. The G×E interactions must be understood if they are to be exploited to improve animal production, particularly in production systems associated with large environments (Vercoe and Frisch, 1992).…”

Section: Introductionmentioning

confidence: 99%

Genotype×Environment Interactions in Growth Performance of Brahman Crossbred Cattle in Bangladesh

Rashid¹,

Hoque²,

Huque³

et al. 2015

Asian J. of Animal Sciences

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The objective was to evaluate the effects of genotype×environment interaction on growth traits of Brahman crossbred cattle. The animals were reared in two environments viz., Central Cattle Breeding Station (on-station) and farmer's herd (on-farm) where management system was respectively intensive and semi-intensive in nature. Birth weight was very similar across environments. Average body weight at different ages was greater in on-station herd than in on-farm herd (p<0.01). Body weight was 23.0, 25.4, 41.5 and 27.5 kg greater at 6, 9, 12 and 18 month in on-station herd than in the on-farm herd, respectively. Significant interaction between sire×environment in most of the growth traits (p<0.001) was observed. Heritability estimates for growth traits were greater in on-station herd (ranged from 0.29-0.47) than in on-farm herd (ranged from 0.48-0.50). Genetic correlations of the same growth trait between two environments showed a decreasing tendency with the increase in age of animal (from 0.74±0.05 at 3 months to 0.57±0.05 at 24 months). These results demonstrate that effects of G×E in Brahman crossbred cattle are large between two types of management system indicating that breeding bull selection and use should be carried out within environment basis.

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“…Some studies have, however, reported differences between these regions (Hetzel et al, 1990), and Meyer (1994) reported that the genetic determinants of growth at various ages were more diverse in the tropics. The large year-to-year and within season environmental variation experienced in the sub-tropics (mainly as a result of variable quantity and distribution of rainfall) may give rise to 'random' sire x year interactions (Notter & Hohenboken, 1990), posing additional difficulties in the identification and selection of superior individuals to be parents for future production (Vercoe & Frisch, 1992). Mathur (2002) advocated the multivariate approach to estimate the genetic correlation for each pair of environments to evaluate the significance of the interactions on breeding programmes.…”

Section: Introductionmentioning

confidence: 99%

Long-term selection experiment with Afrikaner cattle 2. Genetic parameters and genotype x environment interaction for calf growth traits

Beffa¹,

Wyk²,

Erasmus³

2009

SA J. An. Sci.

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________________________________________________________________________________ AbstractA selection and line x environment interaction study with grade Afrikaner cattle was established in 1956 at Matopos Research Station, Zimbabwe. Two selection lines of 100 cows each were reared in different management environments. The non-supplemented (NS) line relied on the range throughout the year and was mated to calve with the onset of the rains (December to February). The supplemented (S) line was offered protein-rich supplements during the dry season and mated to calve prior to the onset of the rains (October to December). In 1976, lines were sub-divided into 75 cows each, where one sub-line remained within each environment as a control; the remaining sub-lines were interchanged between environments. Bulls were selected on weaning weight within control lines, while replacement heifers were selected on weight at mating within sub-line. Data recorded over approximately six generations of selection (40 years) was analyzed. The direct heritability estimates were moderate for birth weight (0.4), but low (0.1 to 0.2) for the other traits, similarly maternal heritabilities were low (0.1 to 0.2). Permanent environmental effects due to dam were moderate (0.3) for weights at 205 days, weaning and at 12 months, and was still an important effect at 18 months. Relatively large negative (-0.4) direct-maternal genetic correlations were indicated for weaning and yearling weights. There were indications that all post-weaning weight traits evaluated were closely related giving rise to their joint inclusion in joint multivariate analysis. There were no indications of line x environment interactions, however, interaction of sire x year was important for all the traits highlighting the tremendous year to year variations experienced in the sub-tropics. There is a need to evaluate selection for genotypic stability, particularly for the more extensive farming environments. ________________________________________________________________________________

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Genotype (breed) and environment interaction with particular reference to cattle in the tropics - Review -

Cited by 18 publications

References 0 publications

Effect of heat stress on six beef breeds in the Zastron district: The significance of breed, coat colour and coat type

Effect of heat stress on six beef breeds in the Zastron district: The significance of breed, coat colour and coat type

Genotype×Environment Interactions in Growth Performance of Brahman Crossbred Cattle in Bangladesh

Long-term selection experiment with Afrikaner cattle 2. Genetic parameters and genotype x environment interaction for calf growth traits

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