Coat characteristics of goats in relation to heat tolerance in the hot tropics

Acharya, R. M.; Gupta, U.D.; Sehgal, J.; Singh, Manohar

doi:10.1016/0921-4488(95)00703-6

Cited by 48 publications

(27 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Cattle studies have shown a major gene effect in some Crioula breeds which causes the expression of extremely short coats (Olson et al 1997a;b;Lucena and Olson 2000;Olson et al 2003) which may be responsible for part of the resistance of these animals. Contrary to this, Acharya et al (1995) showed that Indian goats with long light coloured coats were more resistant.…”

Section: Introductionmentioning

confidence: 61%

Skin and coat traits in sheep in Brazil and their relation with heat tolerance

McManus¹,

Louvandini

Gugel

et al. 2010

Trop Anim Health Prod

View full text Add to dashboard Cite

The objective of this study was to evaluate and compare physical parameters in groups of sheep with different phenotypic characteristics in the Centre-west region of Brazil. Five groups of sheep, with nine animals per group, were selected, three groups of Santa Inês animals with different coat colours (white, brown and black), one group with crossbred animals (Santa Inês × Bergamasca) and one group with animals of the Bergamasca breed. The following traits were evaluated: coat thickness, number and length of hair, pigmentation level in the coat and the skin as well as the percentage area of sweats glands in the skin tissue, carried out by histological analysis. The number of hairs and the area of sweats glands were not significantly different between the evaluated groups. The Bergamasca breed showed low pigmentation of the skin and long hairs. The levels of pigmentation of the hair and of the skin were highly correlated. Between the Santa Inês groups, the group with white hair showed the better parameters for heat adaptation, while the brown hair group showed the lower heat adaptation when compared with another hair breed groups.

show abstract

Section: Introductionmentioning

confidence: 61%

Skin and coat traits in sheep in Brazil and their relation with heat tolerance

McManus¹,

Louvandini

Gugel

et al. 2010

Trop Anim Health Prod

View full text Add to dashboard Cite

show abstract

“…Some of these studies show that the dark melanin-based plumage pigmentation exhibited by wild juvenile birds can force them to spend more time thermoregulating by evaporative cooling than adults with lighter plumage under high ambient temperatures, which may have negative consequences for the survival of juveniles because evaporative cooling increases water loss and thus decreases the amount of water available (Hochscheid, Grémillet, Wanless, & du Plessis, 2002). Similar behavioural constraints of dark pigmentation with potential consequences for survival are observed in both wild and domestic mammals (Acharya, Gupta, Sehgal, & Singh, 1995;Hetem et al, 2009), where physiological costs derived from exposure to high ambient temperatures have also been reported (Fadare et al, 2012;Samara et al, 2015;West & Packer, 2002). In general, these studies come to the conclusion that This study shows that ecological constraints due to dark pigmentation are not restricted to extreme environments (i.e.…”

Section: Discussionmentioning

confidence: 91%

Dark pigmentation limits thermal niche position in birds

2018

View full text Add to dashboard Cite

Animal pigmentation has evolved because of several adaptive functions. In the case of pigmentation produced by melanins, the most common pigments in animals, the main function is protection against UV radiation. However, pigmentation also affects animal surface's ability to absorb solar radiation and gain heat, which may represent a thermal constraint for endotherms due to their relatively high and constant body temperatures. As darker colours absorb more radiation than lighter colours, dark‐pigmented endotherm animals may exhibit limited performance under high ambient temperatures and thus be constrained at occupying hot environments. While the influence of pigmentation on the determination of the thermal niches of ectotherms, particularly reptiles, has been the focus of several studies, this remains an unexplored issue for endotherm animals. Here, we made a detailed quantification of the expression of pigmentation phenotypes produced by melanins in 96 species of birds inhabiting the Spanish sector of the Iberian Peninsula and estimated their climate niche position by calculating the effects of ambient temperature, insolation and precipitation on bird occurrence at a fine 10 × 10 km spatial scale. After controlling for the body size and the nocturnal condition of species, and for phylogenetic and spatial effects, we found a positive association between plumage reflectance and the functional response of bird distribution to spring–summer ambient temperature and insolation but not to precipitation. Thus, bird species preferentially occupying the hotter and sunnier areas of Spain exhibit lighter plumage pigmentation. Our findings suggest that darker birds are limited from occupying environments with high temperatures, unveiling a constraint in endotherms imposed by their pigmentation phenotype. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13094/suppinfo is available for this article.

show abstract

“…In goat ( Capra hircus ), coat color is important for wool production, for heat tolerance in hot climates and for breed identification [Ricordeau and Lauvergne, 1971;Lauvergne, 1978;Lauvergne et al, 1987;Rüssel, 1992;Sponenberg et al, 1998;Adalsteinsson et al, 1994;Acharya et al, 1995]. In this species, the effect of the Agouti locus on coat color and color pattern distribution has been proposed by several authors who analyzed herd book records and segregation data within breeds or from experimental populations [Lush, 1926;Asdell and Buchanan Smith, 1928;Ricordeau and Lauvergne, 1971;Lauvergne, 1978;Lauvergne et al, 1987;Adalsteinsson et al, 1994;Sponenberg et al, 1998].…”

mentioning

confidence: 99%

Copy Number Variation and Missense Mutations of the Agouti Signaling Protein (<i>ASIP)</i> Gene in Goat Breeds with Different Coat Colors

Fontanesi

Beretti

Riggio

et al. 2009

Cytogenet Genome Res

132

121

View full text Add to dashboard Cite

In goats, classical genetic studies reported a large number of alleles at the Agouti locus with effects on coat color and pattern distribution. From these early studies, the dominant A^Wt (white/tan) allele was suggested to cause the white color of the Saanen breed. Here, we sequenced the coding region of the goat ASIP gene in 6 goat breeds (Girgentana, Maltese, Derivata di Siria, Murciano-Granadina, Camosciata delle Alpi, and Saanen), with different coat colors and patterns. Five single nucleotide polymorphisms (SNPs) were identified, 3 of which caused missense mutations in conserved positions of the cysteine-rich carboxy-terminal domain of the protein (p.Ala96Gly, p.Cys126Gly, and p.Val128Gly). Allele and genotype frequencies suggested that these mutations are not associated or not completely associated with coat color in the investigated goat breeds. Moreover, genotyping and sequencing results, deviation from Hardy-Weinberg equilibrium, as well as allele copy number evaluation from semiquantitative fluorescent multiplex PCR, indicated the presence of copy number variation (CNV) in all investigated breeds. To confirm the presence of CNV and evaluate its extension, we applied a bovine-goat cross-species array comparative genome hybridization (aCGH) experiment using a custom tiling array based on bovine chromosome 13. aCGH results obtained for 8 goat DNA samples confirmed the presence of CNV affecting a region of less that 100 kb including the ASIP and AHCY genes. In Girgentana and Saanen breeds, this CNV might cause the A^Wt allele, as already suggested for a similar structural mutation in sheep affecting the ASIP and AHCY genes, providing evidence for a recurrent interspecies CNV. However, other mechanisms may also be involved in determining coat color in these 2 breeds.

show abstract

Coat characteristics of goats in relation to heat tolerance in the hot tropics

Cited by 48 publications

References 4 publications

Skin and coat traits in sheep in Brazil and their relation with heat tolerance

Skin and coat traits in sheep in Brazil and their relation with heat tolerance

Dark pigmentation limits thermal niche position in birds

Copy Number Variation and Missense Mutations of the Agouti Signaling Protein (<i>ASIP)</i> Gene in Goat Breeds with Different Coat Colors

Contact Info

Product

Resources

About