The effect of ruminal starch degradability in the diet of Booroola crossbred ewes on induced ovulation rate and prolificacy

Landau, S.; Bor, A.; Leibovich, H.; Zoref, Zipora; Nitsan, Zafrira; Madar, Z

doi:10.1016/0378-4320(94)01355-p

Cited by 29 publications

(23 citation statements)

References 15 publications

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“…While feeding HEC to nonpregnant sheep was associated with a higher concentration of circulating insulin than feeding HWC [8,9], no such effect was observed in pregnant sheep in the present experiment, probably because the effect of HEC on insulin was confounded with that of pregnancy. Insulin depresses gluconeogenesis and this action is six-fold more potent in pregnant than in non-pregnant ewes [5].…”

Section: Glucose Kinetic Studiescontrasting

confidence: 71%

The influence of extruding corn grain on glucose metabolism in pregnant ewes

Landau

Nitsan²,

Zoref³

et al. 1999

Reprod. Nutr. Dev.

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-Glucose metabolism was studied in 31 pregnant ewes fed mixtures (50:50) of chopped alfalfa hay and corn grain given in whole (HWC) or extruded form (HEC). Number of fetuses was 1 (n = 10), 2 (n = 11) or 3 (n = 10). Diets were supplied at three dietary levels: maintenance (1.0 M), 1.25x maintenance ( I .25 M) or twice maintenance (2.0 M). Glucose metabolism was estimated by a double isotope dilution procedure at days 97-121 of pregnancy. Glucose entry rate (GER) was higher (P < 0.04), and glucose irreversible loss rate (GILR) tended to be higher (P < 0.07) in ewes given HEC than HWC. Dietary level (P < 0.001) and the number of fetuses (P < 0.005) affected GER and GILR positively. These results provide a probable explanation for higher birth weights previously found in lambs born to HEC-, compared with HWC-fed dams. © Inra/Blsevier, Paris. sheep / ewe / glucose metabolism / pregnancy Résumé ― Influence de l'extrusion de maïs sur les concentrations de glucose chez la brebis gestante. Le métabolisme du glucose a été étudié chez 31 brebis gestantes qui ont reçu un mélange (50:50) de foin de luzerne et de grain de maïs distribué entier (HWC) ou extrude (HEC). Le nombre des foetus était 1 (n = 10), 2 (n = 11) ou 3 (n = 10). Les rations ont été distribuées à trois niveaux d'alimentation : entretien (1,0 M), 1,25 x entretien (1,25 M) ou 2 x entretien (2,0 M). Le

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Section: Glucose Kinetic Studiescontrasting

confidence: 71%

The influence of extruding corn grain on glucose metabolism in pregnant ewes

Landau

Nitsan²,

Zoref³

et al. 1999

Reprod. Nutr. Dev.

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“…Within species, the ovulatory response to a common nutritional change can vary between breeds and genotypes. For example, studies using Booroola Merino ewes showed higher ovulation rates in carriers of the Fec B fecundity gene following an increased starch diet for three weeks prior to ovulation, but this increase did not occur in non-carriers of the gene (Landau et al 1995). Such genotype-dependent differences in response to a specific dietary component bring a new dimension to the focus feeding approach described above and raise important issues when considering optimal uses of nutritional resources to improve lifetime reproductive performance.…”

Section: Short-term Effectsmentioning

confidence: 99%

Nutritional effects on oocyte and embryo development in mammals: implications for reproductive efficiency and environmental sustainability

Ashworth

Toma²,

Hunter

2009

Phil. Trans. R. Soc. B

177

114

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The environment in which a breeding female lives prior to conception and during the early stages of her pregnancy has striking effects on oocytes developing in the ovarian follicle and on early embryos in the reproductive tract. Of the various environmental factors known to affect oocyte and embryo development, altered nutrition during this critical period has been particularly well studied. Alterations in the quantity of food consumed or the composition of the diet imposed solely during the pre-mating period affect oocyte maturity, blastocyst yield, prenatal survival and the number of offspring born alive. Importantly, nutrition at this time also affects the quality of embryos and resultant offspring, with increasing evidence from a variety of species showing that periconception nutrition can alter behaviour, cardiovascular function and reproductive function throughout post-natal life. In livestock species, it is important to devise nutritional strategies that improve reproductive efficiency and the quality of offspring but that do not add to the environmental footprint of the production system and which recognize likely changes in feedstuff availability arising from predicted changes in climate.

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“…This effect, termed 'immediate nutrient effect' or 'acute effect', was firstly described to be obtained by supplementing with lupin grains ('lupin effect'; Stewart & Oldham 1986, Teleni et al 1989. Thereafter, numerous studies have reported the positive energy balance of short-term nutritional protocols with energy-yielding nutrients, such as lupin grain (Rowe & Ferguson 1986, Smith & Stewart 1990, Pearse et al 1994, Williams et al 2001, Munoz-Gutierrez et al 2002, corn grain (Landau et al 1995, Letelier et al 2008, infusion of nutrients, like amino acids and glucose (Teleni et al 1989, Downing et al 1995, Landau et al 1996, Rodríguez-Iglesias et al 1996, Rubio et al 1997, Munoz-Gutierrez et al 2002 and metabolic hormones (insulin; Hinch & Roelofs 1986).…”

Section: Introductionmentioning

confidence: 99%

“…In fact, ovulation rate is increased by the administration of glucose and other energy-yielding substrates (glucogenic mixtures), either intravenously (Downing et al 1995, Munoz-Gutierrez et al 2002, intraperitoneally (Rubio et al 1997), orally (Rodríguez-Iglesias et al 1996, Williams et al 2001 or infused into the abomasum (Landau et al 1995). Changes in folliculogenesis have been described to be consisting of an increase in the number of follicles larger than 3.5 mm, but without any effects on the number of smaller follicles (MunozGutierrez et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Glucogenic supply increases ovulation rate by modifying follicle recruitment and subsequent development of preovulatory follicles without effects on ghrelin secretion

Letelier¹,

Mallo²,

Encinas³

et al. 2008

Reproduction

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This study determined the effects of short-term energy inputs on ghrelin secretion and possible links with changes in the follicle population or the ovulation rate. Oestrous cycle was synchronized in 16 Manchega sheep using progestagen sponges and cloprostenol. Half of the animals were treated from days 0 to 4 by the oral administration, twice daily, of 200 ml of a glucogenic mixture containing 70% of glycerol, 20% of 1,2-propanediol and 10% of water; the control group received 200 ml water. The mean (GS.E.M.) plasma glucose increased immediately after the first administration (3.9G0.3 vs 3.0G0.1 mmol/l in control group, P!0.05), remaining statistically different during the treatment. However, plasma ghrelin levels were similar in both groups. On the other hand, the results indicated that short-term energy inputs modify ovulation rate (1.9G0.1 vs 1.3G0.2 in control group, P!0.05) by increasing the number of follicles able to be selected to ovulate during the period of treatment (R4 mm in size; 5.9G0.6 vs 4.3G0.4 at day 2, P!0.05). After sponge withdrawal, the number of these follicles decreased throughout follicular phase (5.8G0.8 to 1.5G0.4, P!0.0005) while the number of large follicles increased (R6 mm in size; 0.8G0.4 to 2.0G0.3, P!0.05); this would indicate an active growth of preovulatory follicles that were not found in the control group. Thus, the increases of ovulation rate by high-energy inputs would be caused by an enhancement in the developmental competence of preovulatory follicles. Reproduction (2008) 136 65-72

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The effect of ruminal starch degradability in the diet of Booroola crossbred ewes on induced ovulation rate and prolificacy

Cited by 29 publications

References 15 publications

The influence of extruding corn grain on glucose metabolism in pregnant ewes

The influence of extruding corn grain on glucose metabolism in pregnant ewes

Nutritional effects on oocyte and embryo development in mammals: implications for reproductive efficiency and environmental sustainability

Glucogenic supply increases ovulation rate by modifying follicle recruitment and subsequent development of preovulatory follicles without effects on ghrelin secretion

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