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The environmental factors on lamb growth, analytically studied with extra-seasonal lambs. II. Extra-seasonal lamb production by the combined treatment of artificial light and hormone



The environmental factors on lamb growth, analytically studied with extra-seasonal lambs. II. Extra-seasonal lamb production by the combined treatment of artificial light and hormone



J. Fac. Fish. Anim. Husb. Hiroshima Univ, 5: 419-429



In 6 trials carried out over a 3-yr. period, 21 anoestrous Corriedale ewes had their eyea covered by an opaque hood for 7 days and after removal of the hoods were subjected to a light regime of decreasing daylength (approx. 10-14 reducing to 81/2-10 hrs.) for 7 days, followed by constant day-length for a further 6-7 days. After the light treatments, ewes were each given 3-5 injections, of 25 mg. progesterone, followed by 750 I.U. PMS and were then placed with a fertile ram.

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