Rabbits’ productive, reproductive and physiological performance traits as affected by heat stress: a review

Marai, Ibrahim; Habeeb, Alsaied Alnaimy Mostafa; Gad, A. E.

doi:10.1016/s0301-6226(02)00091-x

Cited by 297 publications

(339 citation statements)

References 29 publications

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“…Elevated ambient temperature decreased feed intake and depressed the performance of growing rabbits (Marai et al, 2002;Zeferino et al, 2011). Consequently, increasing ambient temperature depressed slaughter weight at a fixed market age and the weights of commercial and reference carcass.…”

Section: Discussionmentioning

confidence: 99%

“…The zone of thermo neutrality for the rabbit is -E-mail: anamoura@fmvz.unesp.br between 218C and 258C according to Cheeke (1987), but the recommended range of ambient temperature, under laboratory conditions, is from 168C to 228C, with relative humidity around 60% to 70% (National Research Council, 1996). The elevation of ambient temperature above this level influences the maintenance of thermal balance, leading to physiological adjustments and changes in the biochemical profile (Chiericato et al, 1994 and that may compromise performance (Marai et al, 2002;Zeferino et al, 2011) and affect carcass and meat quality traits.…”

Section: Introductionmentioning

confidence: 99%

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Carcass and meat quality traits of rabbits under heat stress

Zeferino

Komiyama

Fernandes

et al. 2013

Animal

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Rabbits are very sensitive to heat stress because they have difficulty eliminating excess body heat. The objective of the current study was to evaluate the effects of heat stress on slaughter weight, dressing percentage and carcass and meat quality traits of rabbits from two genetic groups. Ninety-six weaned rabbits were used: half were from the Botucatu genetic group and half were crossbreds between New Zealand White sires and Botucatu does. They were assigned to a completely randomized design in a 2 3 3 factorial arrangement (two genetic groups and three ambient temperatures: 188C, 258C and 308C) and kept under controlled conditions in three environmental chambers from 5 to 10 weeks of age. Slaughter took place at 10 weeks, on 2 consecutive days. Meat quality measurements were made in the longissimus muscle. Actual average ambient temperature and relative humidity in the three chambers were 18.48C and 63.9%, 24.48C and 80.2% and 29.68C and 75.9%, respectively. Purebred rabbits were heavier at slaughter and had heavier commercial and reference carcasses than crossbreds at 308C; however, no differences between genetic groups for these traits were found at lower temperatures. No genetic group 3 ambient temperature interaction was detected for any other carcass or meat quality traits. The percentages of distal parts of legs, skin and carcass forepart were higher in crossbred rabbits, indicating a lower degree of maturity at slaughter in this group. The percentage of thoracic viscera was higher in the purebreds. Lightness of the longissimus muscle was higher in the purebreds, whereas redness was higher in the crossbreds. Slaughter, commercial and reference carcass weights and the percentages of thoracic viscera, liver and kidneys were negatively related with ambient temperature. Commercial and reference carcass yields, and the percentage of distal parts of legs, on the other hand, had a positive linear relationship with ambient temperature. Meat redness and yellowness diminished as ambient temperature increased, whereas cooking loss was linearly elevated with ambient temperature. Meat color traits revealed paler meat in the purebreds, but no differences in instrumental texture properties and water-holding capacity between genetic groups. Purebred rabbits were less susceptible to heat stress than the crossbreds. Heat stress resulted in lower slaughter and carcass weights and proportional reductions of organ weights, which contributed to a higher carcass yield. Moreover, it exerted a small, but negative, effect on meat quality traits.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carcass and meat quality traits of rabbits under heat stress

Zeferino

Komiyama

Fernandes

et al. 2013

Animal

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“…The main difference between humans and rabbits in the thermoregulatory response is that the sweat glands in rabbits are virtually nonfunctional, allowing us to neglect this mechanism [31]. Then, the perspiration rate in (3) was simplified to be zero in the rabbit.…”

Section: Thermoregulatory Responsesmentioning

confidence: 99%

Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

Hirata¹,

Sugiyama²,

Fujiwara³

2009

PIER

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Abstract-Biological effects due to whole-body radio-frequency exposure may be induced by core temperature elevation. According to the international safety guidelines/standards for human protection, the whole-body averaged specific absorption rate (WBA-SAR) is used as a metric. In order to understand the relationship between WBA-SAR and core temperature elevation, a theoretical solution or a closed formula for estimating core temperature elevation is essential. In the present study, we derived a formula for simply estimating core temperature elevation in humans and animals due to whole-body radio-frequency exposure. The core temperature elevation estimated with the formula is found to be in reasonable agreement with the computational results of finite-difference timedomain computation incorporated in anatomically-based models Based on the formula, the WBA-SAR is found to be a good metric for estimating core temperature elevation. The main factors influencing the core temperature elevation are the perspiration rate and the body surface area-to-weight ratio.

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“…Exposure of growing rabbits to heat stress during summer adversely affects their growth and reduces the resistance to diseases and increases postweaning mortality (Marai et al, 2002). Exposing rabbits to heat stress reduces their growth rate, average daily gain and feed efficiency (Ayyat et al, 2004;Villalobos et al, 2008) leading to major production losses.…”

Section: Introductionmentioning

confidence: 99%

Royal jelly: can it reduce physiological strain of growing rabbits under Egyptian summer conditions?

Elnagar

Elghalid

Abdelhady

2010

Animal

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Exposure of growing rabbits to heat stress during summer adversely affects their performance leading to major production losses. A total number of 48 rabbits, unsexed V-line weaned rabbits, were randomly divided into four experimental groups, temperature ranged from high at 328C to low at 238C. Animals of the 2nd, 3rd and 4th group were individually orally given 200, 400 or 800 mg royal jelly (RJ)/kg BW once a week, respectively, to evaluate RJ ability to reduce physiological strain resulted from heat stress. Weekly BW gain increased by 10.4, 11.8 and 10.8%, and feed conversion ratio was significantly improved by 20, 24 and 18% with RJ treatments. Serum total protein, albumin and globulin increased, whereas serum total lipids, cholesterol and triglycerides decreased with RJ treatments. Creatinine was reduced by 21, 30 and 18% and uric acid by 14, 25 and 18% compared with the heat stressed control with the three doses of RJ. Glucose level increased significantly to reach 116, 125, and 120% of heat stressed control. Calcium, phosphorus and alkaline phosphatase increased significantly with RJ treatments indicating the occurrence of active bone deposition. Thyroid hormone levels increased significantly to reach 108, 111, and 112% of heat stressed control rabbits with the three doses of RJ, counteracting the hypothyroid state resulted from heat stress. It can be concluded that RJ administration to heat stressed growing rabbits can reduce physiological strain resulted from heat stress.

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Rabbits’ productive, reproductive and physiological performance traits as affected by heat stress: a review

Cited by 297 publications

References 29 publications

Carcass and meat quality traits of rabbits under heat stress

Carcass and meat quality traits of rabbits under heat stress

Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

Royal jelly: can it reduce physiological strain of growing rabbits under Egyptian summer conditions?

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