The influence of artificial photoperiod on the growth, appetite and reproductive status of male red deer and sheep

Simpson, A M; Suttie, J. M.; Kay, R. N. B.

doi:10.1016/0378-4320(84)90007-1

Cited by 39 publications

(10 citation statements)

References 6 publications

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“…Seasonal cycles of food intake have been documented previously for herbivores (Pollock, 1975;Simpson er al. 1984;Kay &Suttie, 1980), and found that melatonin treatment also had a similar effect to winter daylengths on food intake in montane voles. However, previous studies have shown a depression of food intake under winter daylengths, whereas we have shown it to be stimulated.…”

Section: Discussionmentioning

confidence: 99%

Nutritional ecology of the wild rabbit—an input to the timing of reproduction

Boyd¹,

Bray

1989

Proc. Nutr. Soc.

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Section: Discussionmentioning

confidence: 99%

Nutritional ecology of the wild rabbit—an input to the timing of reproduction

Boyd¹,

Bray

1989

Proc. Nutr. Soc.

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“…They are also observed in feral and domesticated breeds of sheep, although in the latter case the cycles are attenuated and do not exhibit the high amplitude seen in wild ruminants (Simpson et al 1984;Kay, 1985).…”

Section: A) Moose (Alces Alcesmentioning

confidence: 88%

“…For instance, red deer maintained on an artificial 6-month photoperiod such that two cycles of long or short daylength occur in one calendar year exhibit two cycles of food intake and body weight gain, i.e. two rhythms of peak intake followed by a trough (Kay, 1979;Simpson et al 1984). When the cycle is compressed by manipulating the frequency of the photoperiod signal, the peak in appetite lags behind the peak in daylength such that food intake reaches a maximum at a time when photoperiod has started to decrease (Kay, 1979).…”

Section: A) Moose (Alces Alcesmentioning

confidence: 99%

Photoperiod and the regulation of annual and circannual cycles of food intake

Loudon

1994

Proc. Nutr. Soc.

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“…We have during spring and summer (Kay, 1979;Fennessy, focused on manipulating these two factors as a 1982; Suttie et at., 1983). If maintained throughout the means of increasing winter growth rate and thereby year on pasture supplemented over winter with hay, achieving heavier animals at the end of the spring, silage and/or barley, farmed male red deer calves at Appetite follows a strong seasonal cycle that can be Invermay had growth rates of 72 g/day during altered by artificial photoperiod (Simpson et al, 1984; winter and 242 g/day or more during spring and Suttie et al, 1984;Suttie and Simpson, 1985). Energy requirement appears to be affected by climate as stags during winter had a much higher maintenance energy requirement of 0-85 MJ metabolizable energy (ME) per kg M 075 per day compared with only 0-57 MJ ME per kg M 075 per day for stags indoors (Fennessy et al, 1981).…”

Section: Introductionmentioning

confidence: 99%

The effect of housing and food restriction during winter on growth of male red deer calves

1997

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Link to this article: http://journals.cambridge.org/abstract_S135772980001568XHow to cite this article: J. R. Webster, I. D. Corson and J. M. Suttie (1997). The effect of housing and food restriction during winter on growth of male red deer calves. AbstractLow winter growth is a characteristic of male red deer and is caused, in part by a combination of reduced appetite and higher energy expenditure due to cold weather. This study aimed to determine whether housing during winter would reduce energy expenditure and increase the growth rate of male red deer calves. An additional aim was to investigate whether food restriction in winter would be compensated for by increased spring growth. In each of two consecutive years, 80 calves were randomly allocated to eight groups (no. = 10) comprising two replicates of four treatments during winter. Groups were housed inside (I) or outside (O) and given food either ad libitum (AL) or restricted (R) to maintain live weight. Winter treatments (southern hemisphere) ran from 22 May to 25 August (year 1) and from 5 June to 5 September (year 2). During these periods, animals were weighed weekly and group food intake recorded daily. At the end of winter animals were moved outside onto pasture and weighed monthly until the end of spring (27 November, year 1 and 7 December, year 2). In year 2 weighing continued during summer, until 4 April. The animals were slaughtered on 28 November and 18 January (year 1) and April (year 2). The effect of housing on live-weight gain (LWG) and dry-matter intake (DM1) in AL groups was not significant in either year. However in R groups, O had a higher DMI than I in both years (P < 0-05) and a higher LWG than Iin year 1 (P < 0-05). LWG was loiver in R than in AL groups in winter in year 1 (P < 0-05) and year 2 (P < 0-001) and live weight was lower in R than in AL groups at the end of winter in both years. Live weight was still lower in R than in AL groups at the end of spring in both years (P < 0-01). In year 2, this live-weight difference was not significant by the end of summer. Hot carcass weight (HCW) was greater in AL animals than R animals (P < 0-05) and dressing proportion was higher in R than in AL (P < 0-05) in year 1. GR (an index of body fatness) was greater (P < 0-05) in O than I in year 1 and was greater (P < 0-05) in AL than in R animals in year 2. Differences in GR between treatments were not significant in either year, with HCW as a covariate.In conclusion, housing calves given food ad libitum during winter did not reduce DMI or increase growth rate. When normal growth rates were prevented by restricting food intake, housing lowered DMI requirement, although such a situation is unlikely to be a useful farm management practice as recovery from the growth check was slow. Annual variations in climate may determine both the food savings made by housing and the extent of compensatory growth of food-restricted animals in spring.

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The influence of artificial photoperiod on the growth, appetite and reproductive status of male red deer and sheep

Cited by 39 publications

References 6 publications

Nutritional ecology of the wild rabbit—an input to the timing of reproduction

Nutritional ecology of the wild rabbit—an input to the timing of reproduction

Photoperiod and the regulation of annual and circannual cycles of food intake

The effect of housing and food restriction during winter on growth of male red deer calves

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