Influence of Nutrition on Ovulation Rate in the Ewe

Smith, J. F.

doi:10.1071/bi9880027

Cited by 26 publications

(9 citation statements)

References 27 publications

(35 reference statements)

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“…Data of the present experiment support this assertion in that ovulation rates tended to be greater and periovulatory concentrations of E 2 reduced in ewes fed the high-protein diet compared with control-fed ewes. These results support those of Robinson (1990;1996) and Smith (1985;1988), who reported that high-protein supplements enhanced ovulation rates in sheep.…”

Section: Discussionsupporting

confidence: 91%

Effect of excess degradable intake protein on early embryonic development, ovarian steroids, and blood urea nitrogen on days 2, 3, 4, and 5 of the estrous cycle in mature ewes.

Berardinelli

Weng

Burfening

et al. 2001

Journal of Animal Science

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Two trials were conducted to determine whether feeding excess degradable intake protein (DIP) during a synchronized estrous cycle and the first 5 d after breeding alters early embryonic development, ovarian steroids, or BUN concentrations in ewes. Ewes were group-fed in Trial 1 (T1) and individually fed in Trial 2 (T2) either 100 (control; T1, n = 15; T2, n = 12) or 200% (high-protein; T1, n = 16; T2, n = 12) of the NRC protein recommendation for maintenance during a synchronized estrous cycle until surgery in the next cycle. Ampullae (AMP), isthmi (IST), and uterine horns (UT) of high-protein and control ewes were removed on d 2 (T1), 3 (T2), 4 (T1), or 5 (T2) after breeding. In T1, jugular blood samples were taken once daily starting on d 2 of the synchronized cycle, and in T2 on d 2, 9, 15, 16, and 17, and in both trials from estrus (d 0) to the day of surgery. Ampullae, IST, and UT flushings were examined microscopically for the presence of embryos, embryo condition, and embryo cell number. There was no trial x treatment interaction (P > or = 0.10), so data for both trials were pooled. Concentrations of BUN were higher (P < 0.05) in high-protein-fed ewes than in control ewes during the synchronized cycle and the first 5 d of the next cycle. Progesterone concentrations of the synchronized cycle did not differ (P > 0.10) between treatments. During the first 5 d of the next cycle, estradiol-17beta concentrations were lower (P = 0.06) in high-protein-fed than in control ewes. Progesterone increased (P < 0.05) to higher concentrations by d 5 in high-protein-fed ewes than in control ewes. More (P < 0.05) embryos were found in AMP of high-protein-fed ewes than in AMP of control ewes on d 4. Fewer (P = 0.05) embryos were found in UT of high-protein-fed ewes than in UT of control ewes on d 4. More embryos were found in UT of high-protein-fed ewes than in UT of control ewes on d 5. Fewer (P = 0.05) embryos were found in IST of high-protein ewes than in the IST of control ewes on d 5. Embryos of high-protein-fed ewes had more (P < 0.05) cells than embryos from control fed ewes on d 5. Feeding ewes excess DIP protein during an estrous cycle and the first 5 d after breeding initially impeded embryo transport; thereafter, embryo transport and development through the oviduct was accelerated.

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Section: Discussionsupporting

confidence: 91%

Effect of excess degradable intake protein on early embryonic development, ovarian steroids, and blood urea nitrogen on days 2, 3, 4, and 5 of the estrous cycle in mature ewes.

Berardinelli

Weng

Burfening

et al. 2001

Journal of Animal Science

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“…2002a,b). This indicates that an increase in protein intake does not necessarily translate into a higher ovulation rate in rabbits, as appears to be the case in other species, such as sheep (Oldham & Lindsay 1984; Smith 1984, 1988; Teleni et al . 1984) and cattle (Gutierrez et al .…”

Section: Resultsmentioning

confidence: 88%

“…Altering the plane of nutrition induces changes in ovarian follicle size distribution and increases the follicle number in cattle (Maurasse et al . 1985) and in sheep (Smith 1988). Increased dietary intake has been associated with an increase in small follicle recruitment during the first follicular wave of the estrous cycle in Hereford–Friesian heifers (Gutierrez et al .…”

Section: Introductionmentioning

confidence: 99%

Effect of protein level and flushing method on the reproductive performance of rabbits

Iyeghe-Erakpotobor¹,

Olorunju²,

Oyedipe³

2005

Animal Science Journal

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Fifty-five New Zealand white ¥ California cross-bred female rabbits were used to study the effect of protein level and flushing method on the reproductive performance of rabbits. The treatments consisted of three protein diets (18, 20 and 24% crude protein (CP)) and three flushing methods in a 3 ¥ 3 factorial design. The flushing methods consisted of (i) flushing multiparous does and feeding a 16% CP diet during pregnancy; (ii) flushing multiparous does and feeding an 18% CP diet during pregnancy; and (iii) flushing nulliparous does and feeding an 18% CP diet during pregnancy. Flushing rabbits with different levels of protein did not significantly affect gestation length, litter size and mortality of kits. The trend showed an increase in litter weight with the increase in protein level from 18 to 24%. However, kits from does flushed with 24% CP had a higher individual kit weight gain than those on 20 and 18% CP. Gestation length, total litter size at birth, number of kits dead at birth and number of kits dead at 21 days post-partum were not affected by flushing methods. There was, however, a significant effect of the flushing method on the number of kits alive at birth, and 7, 14 and 21 days postpartum. Nulliparous does flushed and maintained on 18% CP during pregnancy had a significantly higher number of kits alive at birth, and 7, 14 and 21 days post-partum. Litter weight was significantly higher for nulliparous does at 7, 14 and 21 days compared with that of multiparous does flushed and placed on a 16 or 18% CP diet during pregnancy. Protein intake during pregnancy had a significant effect on litter birthweight. Nulliparous and multiparous does flushed and placed on an 18% CP diet during pregnancy had a significantly higher litter birthweight than multiparous does flushed and placed on a 16% CP diet during pregnancy. The effect of protein level during pregnancy on the number of kits alive at birth was not significant. There was no interaction between protein level and flushing method on the reproductive performance of rabbits.

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“…These observations suggest that the increased FSH is due to responses at the level of the hypothalamo-pituitary axis. Feeding ewes a high protein diet led to an increased ovulation rate, which was associated with elevated FSH concentrations on Days 2, 3, 4 and 6 before oestrus compared to ewes fed a low protein diet (Smith, 1988). The increases in FSH occurred at a time when it is considered that elevated FSH values can increase ovulation rate in the ewe (McNatty et al, 1985).…”

Section: Gonadotrophin Concentrations and Lupin Grain Supplementsmentioning

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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Influence of Nutrition on Ovulation Rate in the Ewe

Cited by 26 publications

References 27 publications

Effect of excess degradable intake protein on early embryonic development, ovarian steroids, and blood urea nitrogen on days 2, 3, 4, and 5 of the estrous cycle in mature ewes.

Effect of excess degradable intake protein on early embryonic development, ovarian steroids, and blood urea nitrogen on days 2, 3, 4, and 5 of the estrous cycle in mature ewes.

Effect of protein level and flushing method on the reproductive performance of rabbits

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

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