The effects of low level of feeding on response to synchronization of estrus, ovulation rate and embryo loss in goats

Mani, Ariel; McKelvey, W.A.C.; Watson, Estelle D.

doi:10.1016/0093-691x(92)90115-8

Cited by 57 publications

(28 citation statements)

References 18 publications

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“…This study indicated that restriction of dietary energy intake pre-mating resulted in less body weight gain, delay and suppression of oestrus following synchronization, and reduced litter size. These findings are consistent with the observation that low energy intake adversely affected the lambing rate (Mauraya et al, 2004), delayed the onset of oestrus, lowered the ovulation rate and the incidence of multiple ovulations, and further reduced the pregnancy rate in goats (Mani et al, 1992;Kusina et al, 2001).…”

Section: Discussionsupporting

confidence: 80%

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Koyuncu¹,

Canbolat²

2009

J. Anim. Feed Sci.

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The objective of the study was to determine the effects of four dietary energy levels (L 1 -10.3, L 2 -11.0, L 3 -11.6 and L 4 -12.2 MJ ME per kg DM) on oestrus synchronization and fertility in Kivircik ewes. Eighty Kivircik ewes were randomly allocated in equal numbers to the four dietary energy treatments. The groups were treated with intra vaginal sponges containing 40 mg FGA (fluorogestone acetate) for a period of 14 days and 500 IU pregnant mare serum gonadotropin was injected intramuscularly after sponge withdrawal.The proportion of ewes exhibiting overt oestrus within 96 h after the injection was significantly lower (P<0.05) in the L 1 and L 2 eves (86 and 89 %) than in those on the L 3 (100%) and L 4 (100%) treatments, respectively. Mean litter size and fecundity were higher (P<0.05) in the L 3 (1.95) and L 4 (2.05) compared with the L 1 (1.45 and 1.25) and L 2 (1.63 and 1.55) ewes. It is concluded that shortterm (21 days) in the level of dietary energy supplementation pre-mating can have a beneficial effect on reproductive performance in ewes.

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Section: Discussionsupporting

confidence: 80%

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Koyuncu¹,

Canbolat²

2009

J. Anim. Feed Sci.

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“…However, the longer period of restriction probably explains the lower litter size reported in Umberger's study. Indeed, a higher energy amount around the time of breeding increases the ovulation rate in sheep (Lassoued et al, 2004) and goats (Mani et al, 1992). Live weight and BCS of ewes at both lambings were similar among groups in this study (Table 2).…”

Section: Discussionsupporting

confidence: 51%

Effects of restricted feeding of prepubertal ewe lambs on reproduction and lactation performances over two breeding seasons

Villeneuve

Cinq-Mars

Lacasse

2010

Animal

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The aim of this study was to determine the effects of restricted feeding before puberty on reproduction, lactation and offspring growth performance in replacement ewe lambs over two breeding seasons. At weaning, 41 Dorset ewe lambs were assigned to one of three diets: an ad libitum control diet with medium-quality forage (MQF; 13.3% crude protein (CP), 1.81 Mcal metabolizable energy per kg, 42.8% ADF; diet A-MQF); a restricted diet with the same forage as A but less feed concentrate (diet R-MQF); or a high-quality forage (HQF) diet (14.8% CP, 2.15 Mcal ME/kg, 34.7% ADF; diet F-HQF). The quantity of concentrate offered to the group R-MQF and F-HQF ewe lambs was adjusted to obtain 70% of the control ewe lambs' growth rate. The diets were offered for 75 days following weaning to cover the allometric phase of mammary gland development. Prepubertal restriction did not affect (P . 0.10) the gestation rate, number of lambs born or the body weight and body condition score of ewes at lambing or at the end of lactation. Ewes from groups R-MQF and F-HQF tended to produce more milk during their first lactation compared to those from group A-MQF (P 5 0.07). During the second lactation, groups R-MQF and F-HQF had better standardized milk production than group A-MQF (P , 0.05), and group R-MQF produced more milk than group F-HQF (P , 0.05). Milk fat and protein content were not affected by treatments (P . 0.10) Fat and protein yield were affected by treatments only at the second lactation (P , 0.10 and P , 0.05, respectively). Lamb birth and weaning weights were not affected by prepubertal restriction of feeding in their mother (P . 0.10). However, the average daily gain of second breeding season lambs was higher for the R-MQF group than the F-HQF group (P , 0.05), and a similar trend was observed for total gain (P , 0.10). Restricted feeding before puberty does not impair future reproductive performance; however, it has a positive impact on lactation and on lambs' growth performance.

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“…However, this interval was relatively shorter than those reported by Freitas et al (1996a,b), Romano (1996), Freitas et al (1997), Romano (1998), Ak et al (1998), Greyling and Van der Nest (2000) and Motlomelo et al (2002) in does. These differences may be explained by the differences in breed, lactation, nutrition, season, use of gonadotrophins, presence of females in pro-oestrus/oestrus and presence of the male after sponge removal that are known to influence this parameter (Doney et al, 1973;Greyling & Van Niekerk, 1990;Mani et al, 1992;Romano, 1998;Ahmed et al, 1998;Romano, 2002).…”

Section: Resultsmentioning

confidence: 99%

Comparison of fluorgestone and medroxyprogesterone intravaginal sponges for oestrus synchronization in Saanen does during the transition period

Doğan

Nur²,

Günay³

et al. 2004

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe efficiency of medroxyprogesterone acetate (MAP) and fluorogestone acetate (FGA) sponges for synchronizing oestrus in lactating Saanen goats was investigated during the transition from non-breeding to natural breeding season. Does were treated for 11 days with 60 mg MAP (n=19) or 40 mg FGA (n=24) sponges. All does received intramuscular injections of 750 IU pregnant mare serum gonadotrophin (PMSG) and 125 µg cloprostenol (PGF 2 α) 48 h prior to sponge removal. Cervical artificial insemination (AI) with fresh diluted semen was performed at a fixed time (36 and 48 h) followed progestagen withdrawal. The two progestagen treatments showed no significant difference in oestrous response (100% both for MAP and FGA groups), time to the onset (15.8±09 and 15.0±06 h for the MAP and FGA groups, respectively), duration (30.5±1.9 and 34.0±1.4 h for MAP and FGA, respectively) and cessation (42.32±1.6 and 43.25±1.3 h for MAP and FGA, respectively) of the induced oestrus period. No significant difference was observed with respect to pregnancy rates determined at the 53 rd day after AI (52.6 and 50.0% for MAP and FGA, respectively). These dates indicate that the use of MAP and FGA intravaginal progestagen treatments are equally efficient in synchronizing oestrus in lactating goats during the transition from the non-breeding to the natural breeding season. ________________________________________________________________________________

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The effects of low level of feeding on response to synchronization of estrus, ovulation rate and embryo loss in goats

Cited by 57 publications

References 18 publications

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Effects of restricted feeding of prepubertal ewe lambs on reproduction and lactation performances over two breeding seasons

Comparison of fluorgestone and medroxyprogesterone intravaginal sponges for oestrus synchronization in Saanen does during the transition period

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