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The Effect of Extended Photoperiod in Winter on the Growth and Coat Characteristics of Heifer Calves

Published online by Cambridge University Press:  22 November 2017

R.A. Bourne ,
P.R. Trump  and
J.A. Kirk
R.A. Bourne
Affiliation:
Seale-Hayne CollegeNewton Abbot, DevonTQ12 6NQ
P.R. Trump
Affiliation:
Seale-Hayne CollegeNewton Abbot, DevonTQ12 6NQ
J.A. Kirk
Affiliation:
Seale-Hayne CollegeNewton Abbot, DevonTQ12 6NQ
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Extract

Additional daily artificial illumination during winter has been reported to increase growth rates in both cattle and sheep.

In an experiment conducted at Seale-Hayne College between September 22, 1982 and March 29, 1983, 20 Hereford x Friesian heifer calves (approximately 7 days of age at the start of the trial) were randomly allocated to either a natural daylength treatment or an artificially supplemented 16L:8D photoperiod. Animals were weaned at 5 weeks of age and then fed on a restricted concentrate ration (2.5 kg/head/day) with hay provided ad libitum. Body weight, girth and height at shoulder measurements were taken at 2-week intervals. Hair samples (4 cm2) were taken from the mid-flank on January 13.

Type
Calves
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1984 , March 1984 , pp. 142
Copyright
Copyright © The British Society of Animal Production 1984

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