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

Downing, J. A.; Scaramuzzi, R. J.

doi:10.1530/biosciprocs.2.017

Cited by 15 publications

(13 citation statements)

References 52 publications

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“…There are few studies on the impact of tannins-rich plants or extracts on the reproductive performance of large ruminants, although there are several experiments conducted on the small ruminants. However, short periods of improved nutrient supply before and during mating and reproduction have been known to affect ovulation rate along with increased follicles size and/or number ( Bellows et al., 1963 ), reduced related follicular atresia ( Downing and Scaramuzzi, 1991 ), altered plasma gonadotrophin concentration ( Smith, 1988 ) and increased ovarian sensitivity to gonadotropins ( Downing and Scaramuzzi, 1991 ). These effects probably occur as a result of changes in live weight and body condition, energy and protein intake and absorption from the small intestine ( Smith, 1991 , Min et al., 1999 , Min et al., 2001 ), plasma concentration of EAA principally branched chain amino acids (BCAA) ( Waghorn, 1986 , Waghorn et al., 1990 , Downing et al., 1995 ), and levels of plasma metabolic hormones especially insulin ( Downing et al., 1995 ).…”

Section: Resultsmentioning

confidence: 99%

Involvement of Quebracho tannins in diet alters productive and reproductive efficiency of postpartum buffalo cows

et al. 2019

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This study was conducted to investigate the effects of 10 weeks supplementation of Quebracho tannins (QT; 0 [control], 100 [QT 100 ] or 200 g/[cow·d] [QT 200 ]) to 30 multiparous postpartum buffalo cows (10 cows per group) on milk yield and composition, blood metabolites and reproductive performance. Supplementation of QT 100 had no significant effect on milk yield, whereas QT 200 decreased ( P < 0.05) this trait. Compared with the control group, both QT levels decreased ( P < 0.05) fat-corrected milk (FCM) yield, but no significant effects were found on percentages of milk fat and protein. Contrariwise, yields of milk fat, lactose and milk protein were decreased ( P < 0.05) when QT 200 was supplemented. The solids nonfat (SNF) percentage and yield were decreased ( P < 0.05) with QT 100 supplementation. Moreover, QT tended to numerically reduce total number of ovarian follicles, number of small follicles, peripheral progesterone concentration and conception rate. Supplementation of QT 200 numerically increased number of large follicles, mean diameter of large follicle, number and diameters of corpora lutea. The inclusion of QT 200 shortened days open (DO) and decreased number of services per conception. Contrariwise, QT did not show significant effects on serum total protein, albumin, globulin, glucose, cholesterol and triglycerides concentrations. Supplementation of QT 100 caused an increase ( P < 0.05) of serum urea compared with that in control and QT200 groups. Generally, QT decreased ( P < 0.05) serum creatinine concentration. Therefore, the supplementation of a commercial QT to early lactating Egyptian buffalo cows displayed negative consequences on their productive and reproductive performances.

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Section: Resultsmentioning

confidence: 99%

Involvement of Quebracho tannins in diet alters productive and reproductive efficiency of postpartum buffalo cows

et al. 2019

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“…Nutrition can influence reproductive function through changes in body weight and condition in mammals (Downing & Scaramuzzi ; Meza‐Herrera et al ), and follicular development and number of follicles can be increased by nutritional manipulation (Scaramuzzi et al ). For example, Rhodes et al () reported that the diameter of preovulatory follicles in Bos indicus was correlated negatively to weight loss and Beam and Butler () reported that energy balance in postpartum dairy cows influenced follicular growth.…”

Section: Discussionmentioning

confidence: 99%

“…Nutrition can influence reproductive function through changes in body weight and condition in mammals (Downing & Scaramuzzi 1991;Meza-Herrera et al 2008), and follicular development and number of follicles can be increased by nutritional manipulation (Scaramuzzi et al 2006). For example, Rhodes et al (1995) reported that the diameter of preovulatory Means in same row of the same item with different superscripts are different from each other at P < 0.05.…”

Section: Discussion Energy and Protein Supplementation On The Developmentioning

confidence: 99%

Effect of supplements during the cold season on the reproductive system in prepubertal Tibetan sheep ewes

Jing

Peng

et al. 2017

Animal Science Journal

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We examined the development of the reproductive system in prepubertal Tibetan sheep ewes when fed only oat hay (CON) or supplemented with either lick blocks (BS) or concentrate feed (CS) during the cold season. The average daily gain of the CS ewes was greater than that of the BS ewes (P < 0.05), which was greater than that of the CON ewes. The same pattern was observed in the number of ovarian follicles (P < 0.001), that is, CS > BS > CON. Serum concentrations of gonadotropin-releasing hormone, follicle-stimulating hormone, luteotrophic hormone, estradiol and progesterone in the CS and BS groups were higher than in the CON group (P < 0.05). The messenger RNA (mRNA) expression of KiSS-1, GPR54 (G protein-coupled receptor 54), ERα (estradiol receptor α) in the hypothalamic anteroventral periventricular area of the CS group were higher than in both the BS and CON groups (P < 0.05), while the BS group was higher than in the CON group (P < 0.05). Similar differences among groups were observed for gonadotropin-releasing hormone receptor mRNA expression in the pituitary, follicle-stimulating hormone receptor and luteinizing hormone receptor mRNA expression in the ovary. These results indicated that the KiSS1/GPR54 system was more active with nutrition or trace mineral supplementation during the cold season. The system stimulated the hypothalamic-pituitary-gonadal axis and enhanced folliclar development in prepubertal Tibetan sheep ewes. We concluded that energy, protein and trace minerals supplements could improve the reproductive performance of Tibetan sheep on the Qinghai-Tibetan plateau.

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“…In recipients, the result of number (6, 5, and 6, respectively) and the pregnancy rate in embryo transfer in fed high levels of protein (50 %) were higher than the lower groups (25 and 25 %, respectively). In females of small ruminant species, nutritional supplementation stimulates envelopment of the small follicle population [31], growth rate and size of the ovulatory follicle [34], ovulation rate [35], and litter size [36]. In this research, results belonging to CP level and utilization in diets, in ruminants, low protein diets resulted in low BUN, whereas high BUN was associated with high protein diets or excessive protein breakdown.…”

Section: Effect Of Dietary Protein Level On Pregnancy Rate In Embryo mentioning

confidence: 67%

Effect of Dietary Protein Level during Estrus Cycle: Nutrient Digestibility, Quality of Embryo and Pregnancy Rate by Embryo Transfer in Thai Crossbred Goats during Hot Season

Jugsumrit

Yuangklang²,

Vasupen³

et al. 2021

Walailak J Sci & Tech

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Tis study aimed to evaluate the embryo quality and embryo transfer rate of Thai crossbred goats fed different levels of protein in total mixed rations (TMR) during the hot season. Twenty-four non- pregnant Thai crossbred goats with an average body weight of 26±5.9 kg were assigned with a random complete block design (RCBD). Dietary treatments contained 8, 13, and 18 % crude protein (CP) in TMR. The feeding trial lasted for 42 days. Does (female goat) were scheduled to determine embryo quality by surgical laparotomy and flushing. At the end of the feeding trial, the digestion trial was conducted by the total collection method for a 5-day period. The results showed that the average total feed intake and feed conversion ratio did not differ among all treatments (p ˃ 0.05), however, digestible protein intake had increased from 70.39, 79.77 to 89.11 g/d in 8, 13, and 18 % CP group, respectively. Increasing CP levels in TMR resulted in linearly increased goat final body weight (30.25, 28.75, and 32.00 kg), weight gain (3.00, 4.00, and 4.25 kg), and average daily gain (ADG) (87.84, 114.87 and 121.63 g/d). Embryo quality (1, 1, and 3.5 morular follicle state) and pregnancy of embryo transfer rate (25, 25, and 50 %) of the animal received CP level at 8 and 13 % less than that 18 %. These results indicated that dietary protein level during program superovulation regimen affected the good quality of an embryo and the pregnancy rate in an embryo transfer in Thai crossbred goats.

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

Cited by 15 publications

References 52 publications

Involvement of Quebracho tannins in diet alters productive and reproductive efficiency of postpartum buffalo cows

Involvement of Quebracho tannins in diet alters productive and reproductive efficiency of postpartum buffalo cows

Effect of supplements during the cold season on the reproductive system in prepubertal Tibetan sheep ewes

Effect of Dietary Protein Level during Estrus Cycle: Nutrient Digestibility, Quality of Embryo and Pregnancy Rate by Embryo Transfer in Thai Crossbred Goats during Hot Season

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