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

  • R.A. Bourne (a1), P.R. Trump (a1) and J.A. Kirk (a1)

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.

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

  • R.A. Bourne (a1), P.R. Trump (a1) and J.A. Kirk (a1)

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