scholarly journals Secretory Patterns of Leptin and Luteinizing Hormone in Food-Restricted Young Female Sheep

2004 ◽  
Vol 37 (3) ◽  
Author(s):  
SERGIO E RECABARREN ◽  
ALEJANDRO LOBOS ◽  
VERÓNICA TORRES ◽  
ROBERTO OYARZO ◽  
TERESA SIR-PETERMANN
Keyword(s):  
Luteinizing Hormone ◽  
Young Female ◽  
Female Sheep

Pre-puberal plasma luteinizing hormone concentrations and progesterone concentrations during the oestrous cycle and early pregnancy in Galway and Fingalway female lambs

1979 ◽  
Vol 28 (1) ◽  
pp. 1-12 ◽  
Author(s):  
J. F. Quirke ◽  
J. P. Gosling
Keyword(s):  
Luteinizing Hormone ◽  
Young Female ◽  
Oestrous Cycle ◽  
Plasma Progesterone ◽  
Pregnant Females ◽  
Breed Differences ◽  
The Mean ◽  
Ad Libitum ◽  
Maintenance Requirements ◽  
Female Sheep

ABSTRACTTwenty-four young female sheep, 12 Galways and 12 Fingalways, were used to study the effects of breed and level of nutrition on pre-puberal plasma luteinizing hormone and progesterone concentrations throughout the oestrous cycle and during the first 35 days of pregnancy. The sheep were spring-born and were housed at the end of July when they weighed approx. 34 kg. Equal numbers of animals from each breed were fed on a concentrate diet either ad libitum or at a restricted level that was slightly above their estimated maintenance requirements. The Fingalways reached puberty 1 month earlier than the Galways (11 October ±4 days v. 10 November ±5 days). The restricted animals tended (P < 0·10) to reach puberty later than those fed ad libitum (1 November ±5 days v. 20 October ±4 days). Breed differences in the mean level of plasma progesterone on any day of the oestrous cycle were not significant. The mean daily plasma progesterone concentration was similar for the animals on the two planes of nutrition throughout the cycle, with the exception of day 11 when those fed ad libitum had a significantly higher level (P < 0·01). Plasma progesterone levels in the pregnant females between 5 and 35 days post mating were generally higher in Fingalways than in Galways and were not influenced by plane of nutrition. Plasma luteinizing hormone levels tended to be higher, during the 7 weeks before puberty, in Fingalways than in Galways and in animals fed ad libitum than in those on the restricted level of feeding.

The effect of reduction in daylength, level of feeding and age on the reproduction of young female sheep mated at an induced ovulation

1978 ◽  
Vol 26 (3) ◽  
pp. 317-324 ◽  
Author(s):  
R. M. H. Al-Wahab ◽  
M. J. Bryant
Keyword(s):  
Hormone Treatment ◽  
Young Female ◽  
Factorial Experiment ◽  
Induced Ovulation ◽  
Female Sheep

AbstractFifty-six young female Suffolk × (Cadzow Improver × Scottish Blackface) sheep were used in a 2 × 2 × 2 factorial experiment investigating: (i) change in daylength (constant C v. reduced R), (ii) level of feeding (to appetite, H, v. 75% of that allowance, L), and (iii) age at hormone treatment (20 v. 28 weeks). At the appropriate age, the sheep were treated with a progestagen (MAP) and 750 i.u. PMS, inseminated, and slaughtered 26 days later. In a second experiment, change in daylength and level of feeding only were investigated. Hormone treatment took place at 20 weeks of age. In both years, all sheep showed oestrous behaviour and ovulated. A greater number of sheep yielded embryos on C than on R treatments (P<0·05 in Year 2), but no effect of feed level or age was found. Of those sheep not yielding embryos, a greater number on R than on C treatments showed a second ovulation at 20 weeks but not at 28 weeks.

Opioid Inhibition of Luteinizing Hormone Secretion Compared in Developing Male and Female Sheep

1992 ◽  
Vol 56 (6) ◽  
pp. 822-830 ◽  
Author(s):  
Ruth I. Wood ◽  
Helen I’Anson ◽  
Francis J.P. Ebling ◽  
Douglas L. Foster
Keyword(s):  
Luteinizing Hormone ◽  
Hormone Secretion ◽  
Luteinizing Hormone Secretion ◽  
Male And Female ◽  
Female Sheep

scholarly journals Relationships among body composition, circulating concentrations of leptin and follistatin, and the onset of puberty and fertility in young female sheep

2014 ◽  
Vol 151 (3-4) ◽  
pp. 148-156 ◽  
Author(s):  
C.A. Rosales Nieto ◽  
A.N. Thompson ◽  
C.A. Macleay ◽  
J.R. Briegel ◽  
M.P. Hedger ◽  
...  
Keyword(s):  
Body Composition ◽  
Young Female ◽  
Female Sheep

Hourly Administration of Luteinizing Hormone Induces Ovulation in Prepubertal Female Sheep*

Endocrinology ◽  
1984 ◽  
Vol 115 (3) ◽  
pp. 1179-1185 ◽  
Author(s):  
DOUGLAS L. FOSTER ◽  
KATHLEEN D. RYAN ◽  
HAROLD PAPKOFF
Keyword(s):  
Luteinizing Hormone ◽  
Female Sheep
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