Seasonal Variations in the Occurrence of Conceptions in Karakul Sheep

Phillips, Ralph W.; Schott, Ralph G.; Simmons, V. L.

doi:10.2527/jas1947.62123x

Cited by 7 publications

(3 citation statements)

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“…The early weaned group of ewes gave birth to 65% lambs in June as compared to 48% in the late weaned group (P<.05). Similar effects of early weaning have been reported (Phillips et al, 1947;Hafez, 1952;Copenhaver and Carter, 1964;Sefidbakht et al, 1971;Gould and Whiteman, 1973;Speedy and Owen, 1975).…”

Section: Resultssupporting

confidence: 78%

Effect of Early Weaning and Hormone Treatments on Induction of Estrus, Conception and Lambing of Fall-Lambing Karakul Ewes2

Sefidbakht

Farid

1977

Journal of Animal Science

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weaned group (65 vs 48%). Early weaning also seemed to be associated with an increase (P<.05) in lambing percentage (78 vs 53%)and number of lambs weaned per ewe 60 days postpartum (.64 vs .35 lamb). The same trends also were found for weight of lambs born and weight of lambs weaned per ewe exposed to rams for 60 days postpartum. Total number of lambs born per ewe over two lambing periods was higher (P<.05) in the early weaned group than in the late weaned group (1.82 vs 1.56). The same trends were observed for total weight of lambs born. Total weight of lamb per ewe 60 days after lambing was higher (P<.05) in the late weaned group than in the early weaned group (22.92 vs 18.58 kg). This difference is attributed to the artificial rearing at the first lambing which increased mortality and stunted the growth of early weaned lambs. Hormone effects on different aspects of lamb production were not significant.

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Section: Resultssupporting

confidence: 78%

Effect of Early Weaning and Hormone Treatments on Induction of Estrus, Conception and Lambing of Fall-Lambing Karakul Ewes2

Sefidbakht

Farid

1977

Journal of Animal Science

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“…But it does appear that in some cases at least, the lactation anoestrum is reduced to such a short interval that it may be considered nonexistent. Phillips et al (1947) investigated the possibility of obtaining two crops of lambs a year from Karakuls with which they worked in Maryland, U.S.A.…”

Section: Study Of Text-mentioning

confidence: 99%

“…Subsequent investigations into the duration of the sexual season have been conducted in widely separated localities and have involved different breeds of sheep (Kiipfer, 1928;Cole & Miller, 1933;Grant, 1934;Roux, 1936;McKenzie & Terrill, 1937;Kelley & Shaw, 1943;Hammond Jr., 1944a;Phillips, Schott & Simmons, 1947;and others). From these investigations it has been established that a great many breeds, including all those of British origin, experience a restricted sexual season which in general extends over the autumn and winter months.…”

Section: Introductionmentioning

confidence: 99%