Lupin and cowpea supplements for growth, wool production, and reproduction in rams

Pomares, C. C.; Galloway, D. B.; Holmes, J. H. G.; Clarke, I. J.; Tilbrook, Alan John

doi:10.1071/ea9950447

Cited by 7 publications

(3 citation statements)

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“…High protein supplements like lupin grain and cowpea have been shown to stimulate the secretion of FSH (Pomares et al 1995), whereas restricted nutrition induced either a small reduction (Thomas et al 1990) or no change in FSH levels (Barker-Gibb & Clarke 1996). The present data are consistent with our previous results where leptin did not influence FSH secretion in normally fed ovariectomised ewes (Henry et al 1999).…”

Section: Figuresupporting

confidence: 83%

Intracerebroventricular infusion of leptin elevates the secretion of luteinising hormone without affecting food intake in long-term food-restricted sheep, but increases growth hormone irrespective of bodyweight

Henry

Goding

Tilbrook³

et al. 2001

Journal of Endocrinology

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146

114

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Leptin can act as a satiety factor and exert neuroendocrine effects, but most studies have been performed in fasted animals. We aimed to determine the effect of chronic under-nutrition on the response to a 3-day intracerebroventricular infusion of leptin with regard to food intake and the secretion of pituitary hormones. Ovariectomised ewes (n=6) had a mean ( ...) bodyweight of 56 0·8 kg on a diet available ad libitum (ad lib) or 33·4 1 kg on a restricted diet. The differential bodyweight was achieved by dietary means over a period of 6 months prior to the commencement of the study. Leptin (4 µg/h) or vehicle (artificial cerebrospinal fluid (aCSF)) was infused into the third cerebral ventricle for 3 days. Blood samples were taken prior to commencement and on day 3 of infusion for the assay of plasma hormone levels. The experiment was repeated one week later in a crossover design. Food intake and metabolic status were monitored daily. The luteinising hormone (LH) pulse amplitude was lower (P<0·05) but plasma growth hormone (GH) levels were higher (P<0·05) in the food-restricted animals. Plasma levels of glucose, lactate, insulin, urea and triglycerides were similar in the two groups but nonesterified fatty acid levels were higher (P<0·01) in the animals on an ad lib diet. Leptin reduced (P<0·05) food intake only in the animals fed an ad lib diet. Leptin increased (P<0·05) the secretion of LH in the foodrestricted group only and increased (P<0·05) GH irrespective of bodyweight. In conclusion, leptin does not alter food intake in animals on a restricted diet but can increase the secretion of LH in the same animals. The treatment of leptin was not sufficient to reduce plasma GH levels in the food-restricted animals, suggesting that other factors or mechanisms must be involved in the regulation of this axis.

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Section: Figuresupporting

confidence: 83%

Intracerebroventricular infusion of leptin elevates the secretion of luteinising hormone without affecting food intake in long-term food-restricted sheep, but increases growth hormone irrespective of bodyweight

Henry

Goding

Tilbrook³

et al. 2001

Journal of Endocrinology

Self Cite

146

114

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“…Wool production for each animal was determined by utilising mid-side patches where initially an area of 10 cm by 10 cm was shorn from the middle of the right side of each individual sheep on day 1 of the experiment using the small animal clippers (size: 40 blade) for wool sampling (Pomares et al, 1995). On the final day (54th) of the experiment, the wool samples were removed with the same clippers (as 102 A. S. Graham et al…”

Section: Wool Sampling and Analysismentioning

confidence: 99%

Effects of replacing rolled barley grain with wheat dry distillers' grains with solubles in Merino sheep rations

Graham

Jonas

Tanner

et al. 2013

Acta Agriculturae Scandinavica, Section A - Animal Science

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Three studies were conducted to determine the effects of replacing rolled barley grain with either 20% or 40% diet dry matter (DM) of wheat dried distillers' grains with solubles (WDDGS) in Merino wether diets. In the in vitro study, gas and ammonia production were not affected by dietary treatment. The addition of WDDGS in the diet increased total volatile fatty acids, in vitro DM digestibility (IVDMD) and slightly lowered ruminal culture pH. In the in situ study, the WDDGS diets demonstrated faster rate of neutral detergent fibre degradation (k, h (1 ) compared with control diet. In the in vivo study, dry matter intake was about 14% higher for sheep fed 40% WDDGS compared to control or 20% WDDGS. The inclusion of WDDGS in the rations improved greasy and clean wool production, and staple length. This study showed up to 40% WDDGS could replace rolled barley grain in Merino sheep rations to improve wool production.

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“…The feeding of high protein diets decrease the secretion of GH (128, 129) and increase LH release (130) in farm species. The central mechanisms that mediate these endocrine changes are not defined.…”

Section: Models For the Study Of Interactions Between Metabolic Functmentioning

confidence: 99%

Links Between the Appetite Regulating Systems and the Neuroendocrine Hypothalamus: Lessons from the Sheep

Henry¹

2003

J Neuroendocrinology

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The hypothalamus is integral to the regulation of energy homeostasis and the secretion of hormones from the pituitary gland. Consequently, hypothalamic systems may have a dual purpose in regulating both neuroendocrine function and appetite. To date, most studies investigating the interface between appetite and hormone secretion have been performed in rats or mice that have been acutely fasted or baring a genetic abnormality causing either obesity or aphagia. By contrast, various physiological models, including chronic food-restriction or photoperiodically driven changes in voluntary food intake, add further perspective to the issue. In this regard, sheep provide an innovative model whereby long-term changes in body weight or extended feeding rhythms can be investigated. This review compares and contrasts data obtained in different species with regard to the neuroendocrinology of appetite, and discusses the benefits and knowledge gained from using various nonrodent models with a particular emphasis on a ruminant species.

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Lupin and cowpea supplements for growth, wool production, and reproduction in rams

Cited by 7 publications

References 0 publications

Intracerebroventricular infusion of leptin elevates the secretion of luteinising hormone without affecting food intake in long-term food-restricted sheep, but increases growth hormone irrespective of bodyweight

Intracerebroventricular infusion of leptin elevates the secretion of luteinising hormone without affecting food intake in long-term food-restricted sheep, but increases growth hormone irrespective of bodyweight

Effects of replacing rolled barley grain with wheat dry distillers' grains with solubles in Merino sheep rations

Links Between the Appetite Regulating Systems and the Neuroendocrine Hypothalamus: Lessons from the Sheep

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