Post-Partum Intervals of Beef Cows Treated with Progesterone and Estrogen

Foote, W. D.; Hunter, J. E.

doi:10.2527/jas1964.232517x

Cited by 30 publications

(17 citation statements)

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“…This is in agreement with the results of Saiduddin et al (1968), who found no effect of progesterone treatment at earlier stages of the cycle. However, it contrasts with the report of Foote & Hunter (1964), who found an effect of progesterone treatment on the interval to first oestrus in lactating beef cows. The reduction in the interval between calving and first oestrus and between calving and subsequent calving obtained with progestagen/PMSG treatment is in agreement with other workers, results (Smith & Vincent 1972;Chupin et al 1975;Zaied et al 1976).…”

Section: Discussioncontrasting

confidence: 99%

Effect of progestagen intravaginal sponges and PMSG on synchronisation of oestrus in maiden heifers and on interval from calving to oestrus in beef cows

Moore¹,

Smith

1980

New Zealand Journal of Experimental Agriculture

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The effectiveness of progestagen sponges plus PMSG in inducing and synchronising oestrus and pregnancy in nulliparous heifers was assessed. Eighty-one percent of the treated heifers were synchronised, but none of the controls. The hormone treatment advanced the mean calving date by 19 days, but there was no difference between treated and control in the percentage of heifers that finally calved. The interval between calving and first oestrus for hill-country beef cows 2-10 years old in an untreated control group was 94 days, in a group treated with progestagen-impregnated sponges for 21 days was 98 days, and in a group treated with these sponges plus 1000 i. u. of PMSG at the time of withdrawal was 85 days. The last treatment reduced post-par tum anoestrus by 11 days in comparison with the mean of the other two treatments (P < 0.01). There was no difference between age groups in the percentage of cows showing oestrus, conceiving to first service, and calving for the control treatment. However, in the two hormone treatments none of the 2-year-old cows conceived to first oestrus and 13% calved, but 46% of cows in the older age groups cor1Ceived to first oestrus and 79% calved.

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Section: Discussioncontrasting

confidence: 99%

Effect of progestagen intravaginal sponges and PMSG on synchronisation of oestrus in maiden heifers and on interval from calving to oestrus in beef cows

Moore¹,

Smith

1980

New Zealand Journal of Experimental Agriculture

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“…Marion, Norwood & Gier (1968) stated that neither ovariectomy, nor physio¬ logical doses of 17/?-oestradiol influenced regression of the uterus in cows. Foote & Hunter (1964) found that progesterone, with or without oestradiol, shortened the intervals to post partum ovulation and conception, which they interpreted to mean an early return of normal uterine function. However, Marion et al (1968) found that progesterone delayed uterine regression in cattle.…”

Section: Resultsmentioning

confidence: 99%

Reproductive Physiology of the Post Partum Cow

Wc¹,

Saatman²,

Hansel³

1969

Reproduction

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“…415 the effects were unilateral, it was of interest to test for this type of activity in cows during the post-partum interval when a marked difference exists between the size of the two uterine horns, and when the ovaries are resuming follicular development and ovulation. Uterine and ovarian changes during the interval following calving have been described by various workers (Casida & Venzke, 1936;Buch et al, 1955;Ulberg & Lindley, 1960;Foote & Hunter, 1964;and others).…”

Section: Introductionmentioning

confidence: 93%

“…Wiltbank & Cook (1958) found that Shorthorn cows nursing calves had longer intervals from calving to both uterine involution and first ovulation than did cows milked twice daily. In another study, injecting beef cows with progesterone and oestradiol-17\g=b\ after calving shortened the time to uterine involution and to first ovulation (Foote & Hunter, 1964).…”

Section: Introductionmentioning

confidence: 98%

Relationships Between Side of Pregnancy and Side of Subsequent Ovarian Activities in Beef and Dairy Cattle

Foote¹,

Peterson²

1968

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Records from both beef and dairy cows were used to test for utero-ovarian relationships during post-partum anoestrus. It was found that ovarian activity (follicular development and ovulation) first occurred in the ovary opposite the side of the recent pregnancy in a significant majority of the observations. This tendency was greater in the dairy cows. The proportion of cows with ovarian activity on thè opposite side' tended to decrease as the length of the interval from calving to ovarian activity increased. However, the average length of the interval from calving to follicular development or ovulation did not differ significantly between`same side' and`o pposite side' animals.Cows served at the first ovulation after calving had better conception rates when the ovulation occurred on the side opposite the previous pregnancy. This difference between the two sides was greater for cows whose uteri had not yet involuted at the time of service.

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Post-Partum Intervals of Beef Cows Treated with Progesterone and Estrogen

Cited by 30 publications

References 0 publications

Effect of progestagen intravaginal sponges and PMSG on synchronisation of oestrus in maiden heifers and on interval from calving to oestrus in beef cows

Effect of progestagen intravaginal sponges and PMSG on synchronisation of oestrus in maiden heifers and on interval from calving to oestrus in beef cows

Reproductive Physiology of the Post Partum Cow

Relationships Between Side of Pregnancy and Side of Subsequent Ovarian Activities in Beef and Dairy Cattle

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