scholarly journals Plasma progesterone concentration during oestrus cycle and pregnancy in Finnsheep and other prolific sheep breeds

1988 ◽  
Vol 60 (6) ◽  
pp. 554-556
Author(s):  
B. Reklewska ◽  
Z. J. Tyszka ◽  
R. Niznikowski
Keyword(s):  
Breeding Season ◽  
Litter Size ◽  
Progesterone Concentration ◽  
Plasma Progesterone ◽  
Sheep Breeds ◽  
Oestrus Cycle ◽  
Breed Differences ◽  
Reproductive Cycles ◽  
The Relationship

The aim of the study was to evaluate the relationship between the litter size and plasma progesterone (PP) concentration during the breeding season and pregnancy in some prolific sheep breeds. Investigations were performed during two consecutive reproductive cycles. PP concentrations were determined in Finnsheep (n = 16), Polish Heath (n = 13), Friesian (n = 10), Zelazna (n = 12) and Karakul (n = 14). Prolificacy was 3.14, 2.0, 2.0, 1.8 and 1.12, resp. Highly significant differences in PP levels during pregnancy were found between the prolific breeds and breed with the lowest litter size. There was also a significant effect of pregnancy stage on the PP concentration. Breed differences in PP levels during the oestrus cycle were the most pronounced on the 10th day of the cycle. However, due to a considerable variation within breeds they were statistically insignificant.

Plasma progesterone and body weight in the pregnant and non-pregnant kowari, Dasyuroides byrnei (Marsupialia:Dasyuridae)

1989 ◽  
Vol 1 (1) ◽  
pp. 65 ◽  
Author(s):  
TP Fletcher
Keyword(s):  
Body Weight ◽  
Breeding Season ◽  
Oestrous Cycle ◽  
Progesterone Concentration ◽  
Plasma Progesterone ◽  
Oestrus Cycle ◽  
Basal Concentration

Female kowaris are seasonal breeders (May-November) with a gestation of 32.5 +/- 1.8 days (mean +/- s.d., n = 35). The oestrus cycle including pregnancy is 59.0 +/- 6.7 days in duration (mean +/- s.d., n = 12) and is not significantly different from the non-pregnant cycle of 60.3 +/- 7.1 days (mean +/- s.d., n = 15) (P greater than 0.1). Animals maintained on a fixed diet show an increase and fall in body weight before oestrus and again at the end of the oestrous cycle or a pregnancy; these changes correlate closely with progesterone concentration. Plasma progesterone concentration and body weight were measured in six kowaris undergoing an oestrous cycle then a pregnancy in the breeding season of 1981. The basal concentration (mean +/- s.d.) of progesterone prior to the breeding season was 0.35 +/- 0.21 ng mL-1. There were mean rises of 1.84 +/- 1.1 and 2.47 +/- 1.5 ng mL-1, respectively, before the first and second oestrous periods which had declined to near basal levels by the day of oestrus. Peak values of 9.9-11.5 ng mL-1 were measured between days 23 and 30 of oestrous cycle and pregnancy. The pattern of changes in body weight and plasma progesterone concentration was similar in pregnant and non-pregnant animals but the decline in weight and progesterone occurred earlier in pregnant kowaris.

scholarly journals Ovarian follicular dynamic and plasma progesterone concentration in Alpine goats on the breeding season

2018 ◽  
Vol 70 (6) ◽  
pp. 2017-2022 ◽  
Author(s):  
N.G. Alves ◽  
C.A.A. Torres ◽  
J.D. Guimarães ◽  
E.A. Moraes ◽  
P.B. Costa ◽  
...  
Keyword(s):  
Breeding Season ◽  
Progesterone Concentration ◽  
Plasma Progesterone

scholarly journals Breed Differences in Plasma Progesterone Concentration in the Bovine during Proestrus1

1971 ◽  
Vol 5 (3) ◽  
pp. 258-261 ◽  
Author(s):  
D. R. Lamond ◽  
D. M. Henricks ◽  
J. R. Hill ◽  
J. F. Dickey
Keyword(s):  
Progesterone Concentration ◽  
Plasma Progesterone ◽  
Breed Differences

scholarly journals The use of Cloprostenol and prostaglandin F2alpha to induce luteolysis in reindeer calves (Rangifer tarandus)

Rangifer ◽  
1991 ◽  
Vol 11 (2) ◽  
pp. 13 ◽  
Author(s):  
Erik Ropstad ◽  
Dag Lenvik
Keyword(s):  
Breeding Season ◽  
Rangifer Tarandus ◽  
Prostaglandin F2alpha ◽  
Progesterone Concentration ◽  
Plasma Progesterone ◽  
Blood Samples ◽  
Treatment Groups ◽  
Significant Fall

A total of 126 reindeer of about 7 months of age, were isolated from a flock at the end of the breeding season. The animals were treated either with 12.5 mg prostaglandin F2alpha (n = 41) or 0.25 mg cloprostenol (n = 50). Thirty-five animals were left untreated. Blood samples were collected before treatment and 2 Vi days later and the plasma progesterone concentrations were determined. A significant fall in progesterone concentration was seen in both treatment groups. A large proportion of animals responded to treatment with cloprostenol than with prostaglandin F2alpha. It was concluded that prostaglandins can be used to induce luteolysis in reindeer.

Oestrous Activity and Ovulation Rate in Rasa Aragonesa Ewes Maintained at two Different Body Condition Levels Implanted or Reimplanted in the Seasonal Anoestrus with Exogenous Melatonin

1994 ◽  
Vol 1994 ◽  
pp. 221-221
Author(s):  
L. Zarazaga ◽  
Z. Rondon ◽  
F. Forcada ◽  
J.A. Abecia ◽  
M.A. Sanz
Keyword(s):  
Nutritional Status ◽  
Breeding Season ◽  
Litter Size ◽  
Body Condition ◽  
Ovulation Rate ◽  
Sheep Breed ◽  
Reproductive Parameters ◽  
Melatonin Treatment ◽  
Exogenous Melatonin ◽  
Sheep Breeds

The effects of melatonin implants in advancing the breeding season and enhancing both ovulation rate (OR) and litter size in the ewe are well documented (Haresign et al., 1990; López and Inskeep, 1991). Likewise, oestrous activity and OR in the early breeding season can be stimulated by a moderately and constant body condition (BC) in Mediterranean sheep breeds (Forcada et al., 1992). However, little information is available in relation to the effect of nutritional status in ewes receiving exogenous melatonin on reproductive parameters. The present study was carried out to determine the effects of a constant BC throughout the year, and implant or reimplant of exogenous melatonin on onset of oestrous activity and OR in a reduced seasonality sheep breed.The experiment was designed as a 2x2 factorial. Factors were two constant BC levels (≤2.50; L, and ≥2.75; H) and two forms of melatonin treatment (one implant -Melovine™- placed the 8th April; M, and a second implant 49 days later; 2M).

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