Some Effects of Differences in Dietary Energy and Protein Levels on the Ovary and the Anterior Pituitary Gland of the Ewe

Gn, Memon; Rj, Antoniewicz; Nj, Benevenga; Al, Pope; Le, Casida

doi:10.2527/jas1969.28157x

Cited by 12 publications

(4 citation statements)

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“…Although the relationship between plasma LH concentrations in prepuberal females and genetic potential for ovulation rate is variable and age dependent, the trends in the present data are consistent with the results of Hanrahan et al (1977). The higher plasma LH levels in those females fed ad libitum in the present experiment are consistent with these findings and also with the observation that high levels of nutrition in mature ewes results in hypertrophy of the pituitary gland (Bellows, Pope, Meyer, Chapman and Casida, 1963;Howland et al, 1966;Memon, Antoniewicz, Benevenga, Pope and Casida, 1969). Plasma LH levels are reduced in rats (Howland, 1972) and hamsters (Howland and Skinner, 1973) by underfeeding.…”

Section: Discussionsupporting

confidence: 89%

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

Quirke

Gosling

1979

Anim. Sci.

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Twenty-four young female sheep, 12 Galways and 12 Fingalways, were used to study the effects of breed and level of nutrition on prepuberal 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 (F<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.

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Section: Discussionsupporting

confidence: 89%

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

Quirke

Gosling

1979

Anim. Sci.

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“…These workers ascribed the effect to the higher protein content of the lupin grain. While the effects of inadequate protein have been known for many years, most attempts to determine the relative importance of protein or energy contents of the diet have indicated that energy was the most important (Memon et al 1969;Braden and Mattner 1970;Torell et al 1972). More recently work by Fletcher (1981) and Davis et al (1981) has indicated significant effects of protein on ovulation rate.…”

Section: Composition Of Feedstuffs -Role Of Protein and Energymentioning

confidence: 99%

Influence of Nutrition on Ovulation Rate in the Ewe

Smith¹

1988

Aust. Jnl. Of Bio. Sci.

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The effect of nutrition on ovulation rate in the ewe is reviewed with particular reference to the role of protein and energy and the time of effect during the cycle. Ovulation rate is increased by both protein and energy. In the case of protein this was shown to be accompanied by increased plasma levels of FSH and androstenedione at about the time of luteolysis, while levels of LH were unaffected. Increased hepatic oxidative enzyme activity is proposed as a mechanism by which nutrient intake may influence ovulation rate.

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“…In contradiction to these observations, no response in ovulation rate occurred in ewes fed 400 g starch per day (Nottle et al, 1986). Using a 2 x 2 factorial design in which ewes were fed two levels of energy and two levels of protein, Memon et al (1969) found that feeding high energy levels increased ovulation rate irrespective of the level of protein fed. This increase was due largely to an increase in the percentage of ewes with multiple ovulations.…”

Section: Energy or Protein?mentioning

confidence: 99%

Nutrient effects on ovulation rate, ovarian function and the secretion of gonadotrophic and metabolic hormones in sheep

Downing

Scaramuzzi²

2019

Proc

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Some Effects of Differences in Dietary Energy and Protein Levels on the Ovary and the Anterior Pituitary Gland of the Ewe

Cited by 12 publications

References 0 publications

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

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

Influence of Nutrition on Ovulation Rate in the Ewe

Nutrient effects on ovulation rate, ovarian function and the secretion of gonadotrophic and metabolic hormones in sheep

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