The Effect of the Environmental Temperature on the Growth of New-born Rabbits Reared in Incubators

Bernard, Edwin J; Hull, D

doi:10.1159/000239921

Cited by 16 publications

(6 citation statements)

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“…Despite this small imbalance, the distribution of weights among treatments was conservative in the sense that it should have favored pups in the coolest treatment. Furthermore, the results are consistent with the report of Bernard and Hull (1964) that rabbit pups raised in incubators at 25 C were significantly lighter and cooler on Day 7 than pups raised at 30 C, and that the latter were lighter and cooler than pups raised at 35 C. The lack of a significant difference in mortality among the three treatment groups supports the choice of 25 C as a low temperature still compatible with pup survival.…”

Section: Resultssupporting

confidence: 90%

“…Rabbit pups are born without fur and with a relatively large surface area relative to body mass. To maintain a stable body temperature, newborn pups are dependent on the insulating properties of the fur-lined nest, and if isolated from this and littermates, they are unlikely to survive (Bernard & Hull, 1964;Canali et al, 1991;Hardman, Hey, & Hull, 1969;Hardman & Hull, 1969b;Hull, 1965;Ross et al, 1956;Zarrow et al, 1963).…”

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confidence: 99%

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Thermal benefit of sibling presence in the newborn rabbit

Bautista

Drummond

Martı́nez–Gómez

et al. 2003

Developmental Psychobiology

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Newborn rabbits compete vigorously for the mother's milk, and survivors benefit from littermate deaths. Here we report that rabbit pups also may benefit from littermate presence in terms of increased thermal efficiency. Pups nursed normally once a day by their mother but otherwise raised alone had a lower probability of survival, lower body temperature, and lower efficiency of converting milk into body mass than their siblings raised with littermates. The contribution of a more favorable thermal environment to the better growth and survival of group-raised pups was supported by the finding that single pups raised at higher ambient temperatures grew more rapidly than single pups raised at lower temperatures. These effects were most clearly seen across Days 2 to 5, after which time differences between treatment groups were no longer significant. Thus, the results of this study suggest that the benefits as well as costs of having siblings must be weighed against each other when considering the manner in which sibling presence influences individual development and survival.

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Section: Resultssupporting

confidence: 90%

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confidence: 99%

Thermal benefit of sibling presence in the newborn rabbit

Bautista

Drummond

Martı́nez–Gómez

et al. 2003

Developmental Psychobiology

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“…The rabbits used in this investigation had been reared in a thermoneutral environment (34-36°C) since birth and they had been fed once each day by the does (Bernard & Hull, 1964). Thirty-one rabbits 6-8 days old weighing 85-150 g were separated from the does immediately after a feed and kept in a thermoneutral environment for 24 hr.…”

Section: Methodsmentioning

confidence: 99%

Fat metabolism and heat production in young rabbits

Hardman¹,

Hey²,

Hull³

1969

The Journal of Physiology

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SUMMARY1. The rates of oxygen consumption were measured in 6-8-day-old rabbits at 34 and 150 C after varying periods of starvation and cold exposure. At the start of the experiment the rabbits had been fasted for 24 hr. Eight rabbits were studied immediately, six after 24 and six after 48 hr in a cold environment (200 C), and twelve after a further 48 hr in a warm environment (340 C). All the animals had a similar increase in oxygen consumption during the final hour of cold exposure (150 C).2. The rabbits kept at 200 C lost 83 % of the fat stored in their brown adipose tissue within 24 hr and a further 11 % in the next 24 hr. The fat content of white adipose tissue had fallen by 75 % at 48 hr. In contrast rabbits kept unfed at 340 C had lost 47 % of the fat in brown adipose tissue and 44 % of the fat in white adipose tissue after 48 hr.3. In six rabbits subcutaneous thermocouples demonstrated that local heat production continued in brown adipose tissue after 48 hr cold exposure.4. In the rabbits kept at 340 C the final cold exposure caused a large increase in the serum free fatty acid and glycerol concentrations. Much lower concentrations were found in rabbits kept at 20°C.5. The results show that the fat stored in the brown adipose tissue of young rabbits exposed to cold is preferentially used for heat production. When this store of fat is exhausted, brown adipose tissue still produces heat presumably by oxidizing fat and glucose taken from the circulation.

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“…It is important to emphasize at this point that to prevent the rabbits becoming hypothermic while away from the nest, they were kept at their thermoneutral temperature (Hull, 1965). Bernard & Hull (1964) have shown that hypothermic neonatal rabbits are unable to suckle and, as a result, will either die of starvation or be cannibalized by the doe. Complications such as these would obviously make the interpretation of survival experiments impossible.…”

Section: Discussionmentioning

confidence: 99%

Local and general responses to injury in the newborn rabbit

Little

1969

Postgraduate Medical Journal

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Summary Some physiological responses to experimental bilateral hind limb ischaemia have been studied and compared in neonatal and young rabbits. The fluid loss into the injured limbs after removal of the tourniquets has been expressed as a percentage of the plasma volume and of the total body water at the different ages. The reactivity of skin blood vessels to a variety of known mediators of an inflammatory response has been investigated using labelling techniques.

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The Effect of the Environmental Temperature on the Growth of New-born Rabbits Reared in Incubators

Cited by 16 publications

References 0 publications

Thermal benefit of sibling presence in the newborn rabbit

Thermal benefit of sibling presence in the newborn rabbit

Fat metabolism and heat production in young rabbits

Local and general responses to injury in the newborn rabbit

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