Energy Metabolism in Adult Mink in Relation to Protein-Energy Levels and Environmental Temperature

Chwalibog, A.; Glem-Hansen, N.; Henckel, S.; Thorbek, G.

doi:10.1016/b978-0-408-10641-2.50062-8

Cited by 19 publications

(12 citation statements)

References 2 publications

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“…The effect of ambient temperature on digestibility was very small in the present experiments (0.95 at 22" and 0.94 at 6"); a similar result has been reported for mink (Chwalibog et al 1980). These results are in contrast with those obtained with sows and ruminants where a reduction in digestibility was found at lower ambient temperatures, even at a fixed level of food intake (Fuller & Cadenhead, 1969;Westra & Christopherson, 1975;Hovell et al 1977).…”

Section: Discussionsupporting

confidence: 77%

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Effect of dietary protein concentration and ambient temperature on the energy, protein and water metabolism of the rat

Harri¹,

Brockway²

1985

Br J Nutr

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1. Groups of rats (n 8) were offered, to appetite, diets containing 10 (LP), 25 (MP) and 45 (HP) % of gross energy as protein energy from 45 d of age to slaughter 50 d later. At 53 d of age, half the rats on each diet were left at 22" while the other half were transferred to 6". Water balances were measured daily, and digestibilities of energy and nitrogen and the metabolizability of the diets were measured for each rat over a 7 d period at some stage between the age of 74 and 95 d. The rats were slaughtered at day 95 and their carcasses were analysed for protein, lipid, energy and ash contents. Energy expenditure was calculated as the difference between metabolizable energy intake and energy retained.2. Growth performance was best on the MP diet at both temperatures. At 22" the rate of gain of body-weight and of energy retention, although not of protein, were slightly reduced on the HP diet while overall performance was markedly inferior on the LP diet. At 6' the LP diet, while not so good as the MP diet, led to significantly better all-round growth performance than did the HP diet. Cold increased the energy expenditure of the rats by 50% (109-138 kJ/d); the increase was greater for the LP group than for the HP group.3. Intrascapular brown adipose tissue hypertrophied in response to cold and to the LP diet. 4. Adrenal gland size was significantly increased by cold exposure and by increasing level of dietary protein concentration.5. Urine volume was more closely related to the intake of protein than to that of energy. Urinary N concentration for the HP rats was approximately double that for those on the LP diet. Cold-exposed rats had a high water content in their fat-free carcasses, but there were no differences between the dietary treatments.

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Section: Discussionsupporting

confidence: 77%

“…For example, mink (Mustela vison) fed on a high-protein diet show reduced energy retention at low environmental temperatures (Chwalibog et al 1980). This problem may be exacerbated if the animals also face a shortage of drinking-water due to freezing.…”

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confidence: 99%

Effect of dietary protein concentration and ambient temperature on the energy, protein and water metabolism of the rat

Harri¹,

Brockway²

1985

Br J Nutr

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“…The (20 °C) [14]. In relation to this, the food supply in the CON group should sustain maintenance requirements, which was confirmed by the animals' fairly constant live weights.…”

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confidence: 93%

Influence of different planes of energy supply prior to the breeding season on blood metabolites in female mink (Mustela vison)

Fink¹,

Tauson²,

Forsberg³

1998

Reprod. Nutr. Dev.

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“…For a period of 34 d the animals were fed in restricted amounts in order to reach a target weight of 800 g, corresponding to a lean body condition. The daily food supply was 50 g providing 250 kJ ME, and assuming a ME requirement for maintenance of 527 kJ/kg 0·75 (Chwalibog et al 1980); this corresponded to approximately 35 % ME requirement for maintenance at the start of the experiment, increasing to about 55 % ME requirement for maintenance at the target weight of 800 g. This level of restriction was justified by the fact that carnivores with seasonal cycles of fat accretion and mobilization may experience prolonged periods of low food intake or even fasting when living in the wild, and these animals had substantial body reserves available for mobilization. After the period of restricted feeding the animals were refed ad libitum for a period of approximately the same length as the restriction period.…”

Section: Methodsmentioning

confidence: 99%

Body-weight changes are clearly reflected in plasma concentrations of leptin in female mink (Mustela vison)

Tauson¹,

Forsberg

2002

Br J Nutr

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The mink is a seasonal breeder with a propensity for seasonal fatness, and it is very responsive to changes in energy supply. The objectives of the present study were first, to validate a multispecies leptin assay for mink (Mustela vison) plasma, and second, to evaluate how plasma leptin and insulin concentrations responded to energy restriction and body-weight loss and refeeding with restoration of body reserves. The study was performed with six very fat yearling females (initial mean body weight 1451 (SD 119) g, i.e. approximately 300 g more than for a female in normal body condition). The animals were fed in restricted amounts (about 35 % metabolizable energy requirement for maintenance) in order to reach a very lean body condition. The target weight of 800 g was reached after about 1 month of restriction. The animals were then refed ad libitum until almost complete weight recovery. Blood samples were taken on days 1, 24, 34 (end of restriction), 44, 55 and 71 (end of experiment) and analysed for plasma concentrations of leptin and insulin. Three females were mated on day 44. Leptin and insulin concentrations mirrored each other and clearly reflected changes in body weight. Significant ðP,0·001Þ Pearson correlation coefficients of 0·75 (leptin -insulin), 0·72 (leptin -body weight) and 0·59 (insulinbody weight) were found. Two of the three females that were mated gave birth to normal litters. It was concluded that the leptin assay yielded acceptable results for animals with body weight:fat content within the range investigated here, and that plasma leptin reflected body fat mass.

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Energy Metabolism in Adult Mink in Relation to Protein-Energy Levels and Environmental Temperature

Cited by 19 publications

References 2 publications

Effect of dietary protein concentration and ambient temperature on the energy, protein and water metabolism of the rat

Effect of dietary protein concentration and ambient temperature on the energy, protein and water metabolism of the rat

Influence of different planes of energy supply prior to the breeding season on blood metabolites in female mink (Mustela vison)

Body-weight changes are clearly reflected in plasma concentrations of leptin in female mink (Mustela vison)

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