Response of New Zealand white rabbits to thermal stress and its amelioration during winter and summer of North Sinai, Egypt

Abdel-Samee, A. M.

doi:10.1006/jare.1996.0189

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…The ratio water/feed intake was higher than that recorded at 208C in adult rabbits (Prud'hon, 1976), but lower than that observed by Finzi et al (1992) in a climatic chamber (2.5 v. 3.5 and 8.3 ml/g at 268C and 328C, respectively) or by Marai et al (2005) in Egyptian hot conditions (4.4 ml/g), and similar to Egyptian mild conditions (2.8 ml/g). It might be explained by the differences in both ambient temperature and water temperature and/or water quality among studies (Abdel-Samee, 1997;Marai et al, 2005). These results suggest that feed intake is limited by heat stress, even during the night, and that clipping --No significant effect of breeding system, cycle and breeding system 3 cycle was detected.…”

Section: Discussionmentioning

confidence: 76%

Effect of breeding system, cycle and cage size during fattening on rabbit doe and growing rabbit performance under heat stress

Villalobos

Guillén

García

2010

Animal

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In order to evaluate heat stress and circadian rhythm 46 nulliparous rabbit does with a BW of 3.67 6 0.05 kg (s.e.) were used. They were clipped once or not and rectal temperature, feed and water intake were recorded for 24 h. From this group, 43 rabbit does were mated 7 days after rectal measurements, and randomly assigned to one out of two breeding systems (including in both systems rabbit does that had been clipped or not). In the control one (C) rabbit does were mated 14 days after parturition and litter weaned at 35 days of age, and in the extensive one (E) they were mated 21 after parturition and weaned at 42 days of age. Rabbit doe and litter performance were recorded for 6 months (first three cycles). Two hundred twenty-eight weaned rabbits were divided into two cage sizes: 0.5 and 0.25 m 2 with eight and four rabbits per cage, respectively, to study growing performance. Farm and rectal temperatures were minimal and feed and water intake maximal during the night ( P , 0.001). Unclipped rabbit does showed higher rectal temperature ( P 5 0.045) and lower feed intake ( P 5 0.019) respect to clipped does, which are symptoms of heat stress. Neither breeding system nor cycle number influenced fertility, total number of kits born, born alive or dead per litter (91.6%, 6.98, 5.80 and 1.19 on average, respectively). Kit mortality during lactation tended to increase in E compared with C group (48.5% v. 63.4%; P 5 0.070), reducing the number of kits at weaning per litter by 33% ( P 5 0.038). It also increased in the second and third cycles compared with the first ( P < 0.054). It resulted that feed efficiency (g weaned kits/ g feed intake does 1 litter) tended to decrease in E respect C group ( P 5 0.093), whereas it was impaired successively from the first to the third cycle by 48% ( P 5 0.014). Growing rabbits from the E group were heavier at weaning (by 38%; P , 0.001), showed a higher feed intake (17.4%) and lower feed efficiency (28.4%) throughout the fattening period ( P < 0.056) respect to C group. However, age at slaughter was not different respect to C group (77.3 days on average). Cage size had minor influence in growing performance. In conclusion, rabbit doe and litter productivity impaired when lactation is extended from 35 to 42 days and along successive reproductive cycles.

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Section: Discussionmentioning

confidence: 76%

Effect of breeding system, cycle and cage size during fattening on rabbit doe and growing rabbit performance under heat stress

Villalobos

Guillén

García

2010

Animal

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“…The comfort zone in rabbits is 21ºC, so exposure of rabbits to a higher temperature may bring a heat load on the animal [6]. If the internal body temperature reaches 35ºC, the natural physiological mechanisms of heat loss are no longer functioning and heat prostration occurs [7], and as a result, the normal physiological response of animal is to lower the level of metabolic hormones and enzymes [8].…”

mentioning

confidence: 99%

Breed Effects on Growth Performance, Blood Parameters and the Levels of Metabolic Hormones in Rabbits Under Heat Stress in Egypt

Abdel-Hamid

Dawod

2020

Zagazig Veterinary Journal

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This study was constructed to investigate the differences between three breeds of rabbits [New Zealand White (NZW), Rex and Egyptian Gabali (Al-Gabali)] under heat stress regarding growth traits, hematological, biochemical and immunological parameters, oxidative stress biomarkers as well as metabolic hormones. Thirty rabbits of each breed (4 weeks of age) were subjected to heat stress (32 ± 1°C, 70-80% relative humidity) in the summer season at the period from mid-July to the end of August 2019. Blood samples were collected at 10 th week of age. The results revealed that body weights of NZW and Rex were higher by 205 and 145 g, respectively than those of Al-Gabali as well as average daily gains of NZW and Rex were higher by 4.42 and 3.40 g/day, respectively compared with Al-Gabali (P <0.05). Average daily feed intake of Rex was lower by 7.65 g/day than those of NZW and 2.89 g/day compared with Al-Gabali (P <0.05) and they had the lowest feed to gain ratios (3.58±0.097). Aspartate aminotransferase, urea and creatinine were significantly lowered in the plasma of Al-Gabali compared with NZW and Rex whereas, Al-Gabali recorded higher total proteins (5.90±0.048 g/dL), total globulins (2.50±0.054 g/dL), antibody titer against sheep red blood cells (6.38±0.111) and superoxide dismutase (7.42±0.163 IU/L) than NZW (5.66±0.069 g/dL, 2.21±0.084 g/dL, 4.90±0.068 and 6.80±0.053 IU/L, respectively) and Rex (5.74±0.072 g/dL 2.25±0.095 g/dL, 4.25±0.095 and 6.88±0.050 IU/L, respectively). Al-Gabali bunnies had higher immunoglobulin G, immunoglobulin A, catalase and glutathione peroxidase than NZW and Rex. However, Al-Gabali recorded the lowest insulin (15.64±0.20 ng/mL), growth hormone (45.80±0.48 ng/mL) and triiodothyronine (136.20±2.15 ng/mL). In conclusion, Al-Gabali rabbits were better adapted to heat stress compared with NZW and Rex, which was reflected in the improvement of health, immunity and oxidative stress indicators as well as lower plasma metabolic hormones, but they didn't have the genetic potential for growth traits.

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“…Milk yield of doe rabbits were measured every week beginning at d 7 post-kindling and continued until d 21. Milk yield was estimated by the suckling-weigh technique which measures the intake of kits after a fasting period (Mousa and Shetaewi, 1995;Abdel-Samee, 1997;Shetaewi et al, 2001). Table (1 The does were removed from their kits nest at 08:00 on the morning.…”

Section: Milk Yield Of Doe Rabbitsmentioning

confidence: 99%

EFFECT OF DIETS CONTAINING SEA-GRASS (Cymodocea nodosa) AND TARO HAULMS (Colocasia esculenta) ON REPRODUCTIVE PERFORMANCE OF NEW-ZEALAND FEMALE RABBITS UNDER NORTH SINAI CONDITIONS

Shetaewi

Mousa

Bakr

et al. 2021

Egyptian Journal of Rabbit Science

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Response of New Zealand white rabbits to thermal stress and its amelioration during winter and summer of North Sinai, Egypt

Cited by 10 publications

References 3 publications

Effect of breeding system, cycle and cage size during fattening on rabbit doe and growing rabbit performance under heat stress

Effect of breeding system, cycle and cage size during fattening on rabbit doe and growing rabbit performance under heat stress

Breed Effects on Growth Performance, Blood Parameters and the Levels of Metabolic Hormones in Rabbits Under Heat Stress in Egypt

EFFECT OF DIETS CONTAINING SEA-GRASS (Cymodocea nodosa) AND TARO HAULMS (Colocasia esculenta) ON REPRODUCTIVE PERFORMANCE OF NEW-ZEALAND FEMALE RABBITS UNDER NORTH SINAI CONDITIONS

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