Control of the Oestrous Cycle in Friesian Heifers With Ici 80,996

Cooper, M. J.; Rowson, L. E. A.

doi:10.1051/rnd:19750232

Cited by 34 publications

(4 citation statements)

References 2 publications

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“…These unpredictable responses mean that either oestrous detection or double insemination of a herd is necessary to achieve normal fertility (Nancarrow and Cox 1976). Following prostaglandin injection the time course of luteolysis is uniform (Cooper and Rowson 1975) indicating that variations in oestrous responses are primarily due to differences in the growth and development of mature Graafian follicles capable of ovulating.…”

Section: Introductionmentioning

confidence: 99%

“…1972). However, quantitative data on the rate of follicular growth in the cow is not available and is clearly an essential to understanding the variability in the time of ovulation following surgical (Brock and Rowson 1952) or chemical (Cooper and Rowson 1975) destruction of the corpus luteum. The aim of this study was to quantitatively appraise ovarian follicular growth in cows treated with a luteolytic prostaglandin.…”

Section: Introductionmentioning

confidence: 99%

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Growth of Graafian Follicles in Cows Following Luteolysis Induced by the Prostaglandin F2a Analogue, Cloprostenol

Scaramuzzi¹,

Turnbull²,

Nancarrow³

1980

Aust. Jnl. Of Bio. Sci.

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Aust. J. Bioi. Sci. 1980, 33, 63-9 The ovaries of six multiparous cows 6--8 years old were collected 49-71 h after injection of a synthetic prostaglandin F analogue (c1oprostenol) and serially sectioned. All follicles >0·4 mm in diameter were counted and measured. The number of normal follicles ranged from 46 to 360 per cow. Atresia was not seen in follicles of < 1 ·7 mm diameter. The number of. early atretic follicles ranged from 4 to 20 per cow.The volume and mitotic index of the granulosa tissue was calculated for all follicles. Follicles were then grouped into classes according to granulosa volume, each class having twice the volume of granulosa of the preceding class. In all cows the rate of growth of follicles was slow up to 0·5 mm diameter (class 4). Above this size growth accelerated to a maximum in follicles of 1·2-1·7 mrn diameter (class 8) and declined thereafter to a minimum in follicles 8-10 mm in diameter (class 13). Follicles beyond class 13 were not present in any of the ovaries. It was estimated that 22·1 days were required for a follicle to grow from 0·4 mm to 10 mm in diameter (classes 4 through to 13).The present data suggest that the pattern of synchronization of oestrus in cattle treated with c1oprostenol may be related to the size of the largest non-atretic follicle present at the. time of treatment because of the time required for such a follicle to complete its development.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Growth of Graafian Follicles in Cows Following Luteolysis Induced by the Prostaglandin F2a Analogue, Cloprostenol

Scaramuzzi¹,

Turnbull²,

Nancarrow³

1980

Aust. Jnl. Of Bio. Sci.

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“…The luteolytic effect of PGF2α in cattle was described by several workers in the early 1970s. In dairy cattle, several studies confirmed the capability of PGF2α and its synthetic analogues like alfaprostol (Randel, 1988), clorprostenol (Cooper and Rowson, 1975), fenprostalene (Stotts et al, 1987) and luprostiol (Plata et al, 1990) to initiate the regression of mature CL in the ovary, thus provoking and synchronizing estrus of animals. Though the estrus synchronization appeared in the world since 45 years (Baruselli et al, 2013) but there is still considerable limitation.…”

Section: Introductionmentioning

confidence: 90%

Monitoring the Sonographic Ovarian Dynamics and Pregnancy Rate in Cyclic Murrah Buffalo Cows Synchronized with Prostaglandin F2α

Harun‐Or‐Rashid

Phulia

Hasan

et al. 2020

J Anim Reprod Biotechnol

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The objective of this research work was to know ovarian dynamics and pregnancy rate of cyclic Murrah buffalo cows with induced estrus by administration of prostaglandin F2α (PGF2α) and timed artificial insemination (TAI) with frozen thawed semen. A total of 31 female buffaloes were selected for the study. The buffalos having matured CL observed by ultrasonography were given one intra muscular injection of cloprostenol 500 μg and TAI was performed using frozen thawed semen of Indian Murrah buffalo bull. Results showed that 90.32% (significantly, at p < 0.05) cows explore the sign of heat after injection of PG and 67.85% (significantly, at p < 0.05) cows were become pregnant out of 28 inseminated (TAI) cows. In the 28 inseminated (TAI) cows, average number of smaller and larger size of follicles were non-significantly (p > 0.05) higher at day 3 post PG injection, but the medium size of follicles was nonsignificantly (p > 0.05) higher at PG injection. At day 3 post PG injection the diameter of follicles was significantly (p < 0.05) higher, but the diameter of CL was significantly (p < 0.01) lower compared at PG injection. At PG injection the diameter of largest follicle was non-significantly differences (p > 0.05) in between pregnant and non-pregnant cows. But at day 3 post PG injection it was significantly (p < 0.01) higher in pregnant cows compared to non-pregnant cows. The number of small, medium, and large follicles at PG injection and at day 3 post PG injection were non-significantly (p > 0.05) difference in between pregnant and non-pregnant buffalo cows. Finally, it is concluded that the CL was effectively regresses and induced the sign of heat in buffalo cows and after AI the cows were become pregnant with significant rate. The study will help to the veterinarian and researcher to know the efficacy of PG injection and AI for reproductive efficiency in buffalo cows.

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“…Neither termination of second and third trimester pregnancy in ponies or mares with prostaglandin analogues nor accompanying plasma progesterone concentrations had been reported. Analogues of PGF2a were luteolytic in horses (1) and cattle (5) and caused parturition within 3 h in mares (16) and 30 h in cows (2) near term. The purpose of this study was a) to determine if single or multiple PG F2a analogue treatments to mares during midgestation would terminate pregnancy and b) to monitor plasma progesterone changes after PGF2a analogue treatment.…”

Section: Introductionmentioning

confidence: 99%

Induced abortion with two Prostaglandin F2α analogues in mares: Plasma progesterone changes

Leeuwen¹,

Noden²,

Dieleman³

1983

Veterinary Quarterly

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Three experiments were conducted to test the abortifacient effects of PGF2 alpha analogues on mares during midgestation (average gestation length 141.5 days). The progesterone concentration was measured by radioimmunoassay. In experiment 1. five mares received an injection of PGF2 alpha analogue (fluprostenol: 500 micrograms intramuscularly) and a second injection either at 24, 48, of 72 h. Although the progesterone concentration decreased (P less than 0.05) an average of 44 per cent in 24 h, none of the pregnancies were terminated. In experiment 2, beginning at least 10 days after experiment 1, the same five mares were given PGF2 alpha analogue as follows: 250 micrograms intravaginally and 500 micrograms intramuscularly. The treatment was repeated 48 h later. Progesterone concentrations had not increased since experiment 1 and did not decrease during the 48 h following either injection. In experiment 3, six mares (average gestation length 162 days) were treated every 6 or 12 h with PGF2 alpha analogue (cloprostenol: 375 micrograms) until expulsion of the fetus occurred at 47 +/- 25 h after the initial injection; the mares received an average of 5 treatments. The progesterone concentration averaged 22 +/- 7 ng/ml before the initial PGF2 alpha treatment, decreased (P less than 0.05) to 8.4 +/- 2.7 ng/ml by 12 h before expulsion and 1-8 +/- 0.4 ng/ml 12 h after fetal expulsion. The progesterone concentration remained below 1.0 ng/ml for the next 4 days. However, only one of six mares exhibited estrual behavior after induced abortion.

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Control of the Oestrous Cycle in Friesian Heifers With Ici 80,996

Cited by 34 publications

References 2 publications

Growth of Graafian Follicles in Cows Following Luteolysis Induced by the Prostaglandin F2a Analogue, Cloprostenol

Growth of Graafian Follicles in Cows Following Luteolysis Induced by the Prostaglandin F2a Analogue, Cloprostenol

Monitoring the Sonographic Ovarian Dynamics and Pregnancy Rate in Cyclic Murrah Buffalo Cows Synchronized with Prostaglandin F2α

Induced abortion with two Prostaglandin F2α analogues in mares: Plasma progesterone changes

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