Onset of puberty and estrous cycle phenomena in Yankasa ewes as monitored by plasma progesterone concentrations

Oyedipe, E.O.; Pathiraja, N.; Edqvist, L.‐E.; Buvanendran, V.

doi:10.1016/0378-4320(86)90040-0

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…Puberty was reached at a fairly constant weight whose attainhent was significantly (PC0.05) delayed by nutrition, unsupplemented lambs taking 4 to 5 months longer ( Table 1 ) . The present mean age at puberty of 350 days (11.5 months) was longer than previously reported (Dyrmundsson, 1973;Oyedipe et al, 1986) Within variable, differing superscripts denote significant differences (P<0.05) between means within the same column. primarily attributed to the delaying effect of poor nutrition.…”

Section: Resultscontrasting

confidence: 65%

“…It was noteworthy, that nine of the twenty lambs (45%) that conceived at first mating did not manifest the transient progesterone increases. In addition, the f i t oestrus of 21.1% lambs Transient increases in progesterone before puberty have been reported in both temperate (Quirke et al, 1985) and tropical ewe lambs (Oyedipe et al, 1986), cattle (Schams et al, 1987) and, before the resumption of ovarian activity following anovulatory periods. Although the present incidence of 63% for lambs manifesting these rises agreed with 67% found by Sutama et al (1988) in Javanese Thin-tail lambs, both values were lower than the 76% obtained by Fitzgerald and Butler (1982) in Dorset and Morlam lambs.…”

Section: Resultsmentioning

confidence: 93%

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Peripubrtal Plasma Progesterone Patterns in Ethiopian Menz Ewe Lambs

Mukasa-Mugerwa¹,

Mutiga²

1993

Journal of Applied Animal Research

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Muksa -Mugenua, E. and Mutiga, E. R. 1993. Penpubertal plasma pmgestemnepatterns in Ethiopian Menz ewe lain bs. J Appl. Anim. Res., 3 : 31-38 Plasma progesterone concentrations were determined every 10 days for 38 grazing Menz ewe lambs from weaning (93 * 7 d) until conception. Lambs wereeither fed extrasupplementary concentrates and / or drenched for endoparasites. Inadequate nutrition delayed puberty onset by 4 to 5 months (PCO.05). Progesterone concentrations, determined by the ELISA technique, were basal (S 1.0 ng/ml) before puberty. Subsequently, 63% lambs exhibited a 'silent ovulation' prior to first behavioural oestrus but, transient rises ofprogesterone were not observed in 45% of lambs conceiving at first mating. Further, first oestrus was unovulatory (non-pubertal) in 21.1% of animals which may bias estimates of puberty onset based only on first oestmus behaviour. 5% of lumbs exhibited a gestational oestrus.

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Section: Resultscontrasting

confidence: 65%

Section: Resultsmentioning

confidence: 93%

Peripubrtal Plasma Progesterone Patterns in Ethiopian Menz Ewe Lambs

Mukasa-Mugerwa¹,

Mutiga²

1993

Journal of Applied Animal Research

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“…Bu kanlar 2000 rpm'de Lo dakika santrifüje edildi. Serumlar plastik tüplere alınarak -20 cC'de derin dondurueuda test yapılıncaya kadar saklandı (15). Abdominal muhafazalı koç kullanarak, bu koyunlarda sabah akşam kızgınlık taraması yapıldı.…”

Section: Materyalunclassified

“…Bu sonuç koyunlarda siklusa başlamanın keçilerin aksine aktif bir kızgın-lık la olmadığını açıklamaktadır (15,19). Koyun ırkıarında sıkl~la görülen bu durum nedeniyle progesteron hormonunun değerlerinin bilinmesi önem taşımaktadır.…”

Section: Bulgularunclassified

SAKız KOYUNLARıNDA EIA TEKNİ(;İ İLE SERLMDA PROGESTERON DÜZEYLERİNıN TAYİNİ

Nesrin;ÖZSAR¹

1988

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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“…Generally, four breeds of sheep are indigenous to Nigeria, namely Balami, Uda, West African dwarf (WAD) and Yankasa. However, Yankasa sheep is the most abundant breed in Nigeria (2), females attaining puberty at 238±23.4 days at an average weight of 18.4±0.4 kg (6). Adult Yankasa ewes weigh 21.48±0.48 kg, and produce lambs in a singleton to twin ratio of 1:2.8 (7).…”

Section: Introductionmentioning

confidence: 99%

Pregnancy-Specific Protein B in Yankasa Ewes During Pregnancy and Postpartum Periods

Adeyeye

Abubakar

Leigh

et al. 2021

Macedonian Veterinary Review

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Pregnancy-specific protein B (PSPB) is produced by mono and binucleate trophoblast cells in the placenta of ruminants during pregnancy. This study was designed to determine the pattern of serum PSPB in Yankasa ewes during pregnancy and postpartum periods. Mature cycling Yankasa ewes were synchronized and divided into two groups A (n=11) and B (n=13). Group A was bred, while group B was unbred. Blood samples for PSPB assessment were collected from the ewes starting from the day of breeding until 4 weeks post-lambing. All pregnant Yankasa ewes lambed with singleton lambs after an average of 151.18 days. There was a significant (p<0.05) increase in PSPB in pregnant compared with the non-pregnant ewes in the period between 3 weeks post-breeding and 3 weeks post-lambing. Peaks were detected in the first (100.60 ng/ml), second (133.90 ng/ml), and third (114.82 ng/ml) trimesters at 5, 10 and 21 weeks of gestation, respectively, but steadily decreased within 4 weeks (2.38 ng/ml) postpartum. In conclusion, PSPB detected pregnancy in Yankasa ewes from 3 weeks post-breeding with peak levels at 5, 10 and 21 weeks post-breeding in the first, second, and third trimesters, respectively. PSPB decreased gradually after lambing until 4 weeks postpartum.

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Onset of puberty and estrous cycle phenomena in Yankasa ewes as monitored by plasma progesterone concentrations

Cited by 9 publications

References 4 publications

Peripubrtal Plasma Progesterone Patterns in Ethiopian Menz Ewe Lambs

Peripubrtal Plasma Progesterone Patterns in Ethiopian Menz Ewe Lambs

SAKız KOYUNLARıNDA EIA TEKNİ(;İ İLE SERLMDA PROGESTERON DÜZEYLERİNıN TAYİNİ

Pregnancy-Specific Protein B in Yankasa Ewes During Pregnancy and Postpartum Periods

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