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

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.

[1]  L. Jauhiainen,et al.  Effect of nutritional flushing on the productivity of Finnish Landrace ewes , 2002 .

[2]  L. Ndlovu,et al.  Effect of different dietary energy level intakes on efficiency of estrus synchronization and fertility in Mashona goat does. , 2001, Small ruminant research : the journal of the International Goat Association.

[3]  A. Mcneilly,et al.  Effects of level of food intake on ovarian follicle number, size and steroidogenic capacity in the ewe. , 1998, Animal reproduction science.

[4]  F. El-Hag,et al.  Effect of strategic supplementary feeding on ewe productivity under range conditions in North Kordofan, Sudan , 1998 .

[5]  D. Kleemann,et al.  Effect of previous undernutrition on the ovulation rate of Merino ewes supplemented with lupin grain. , 1997, Animal reproduction science.

[6]  J. Lozano,et al.  Effect of level of dietary energy and protein on embryo survival and progesterone production on day eight of pregnancy in Rasa Aragonesa ewes. , 1997, Animal reproduction science.

[7]  J. Wilkins.  Method of stimulating ovulation rate in Merino ewes may affect conception but not embryo survival. , 1997, Animal reproduction science.

[8]  A. Branca,et al.  Flushing with soybean meal can improve reproductive performances in lactating Sarda ewes on a mature pasture , 1997 .

[9]  A. Branca,et al.  Effect of grazing background and flushing supplementation on reproductive performance in Sarda ewes , 1995 .

[10]  R. Scaramuzzi,et al.  Ovulation rate and the concentrations of gonadotrophic and metabolic hormones in ewes fed lupin grain. , 1995, Journal of reproduction and fertility.

[11]  A. U. Mani,et al.  The effects of low level of feeding on response to synchronization of estrus, ovulation rate and embryo loss in goats. , 1992, Theriogenology.

[12]  J. Abecia,et al.  Seasonal changes in oestrus activity and ovulation rate in Rasa Aragonesa ewes maintained at two different body condition levels , 1992 .

[13]  R. G. Gunn,et al.  The effect of feeding supplements in the autumn on the reproductive performance of grazing ewes 1. Feeding fixed amounts of supplement before and during mating , 1992 .

[14]  R. G. Gunn,et al.  The effect of feeding supplements in the autumn on the reproductive performance of grazing ewes 2. Feeding supplements in relation to sward height , 1992 .

[15]  K. K. Schillo.  Effects of dietary energy on control of luteinizing hormone secretion in cattle and sheep. , 1992, Journal of animal science.

[16]  P. Booth.  Metabolic influences on hypothalamic-pituitary-ovarian function in the pig. , 2020, Journal of reproduction and fertility. Supplement.

[17]  B. N. Day,et al.  Endocrine changes associated with a dietary-induced increase in ovulation rate (flushing) in gilts. , 1989, Journal of animal science.

[18]  R. G. Gunn,et al.  Effect of restricted food intake, before and/or after mating, on the reproductive performance of Greyface ewes , 1989 .

[19]  J. D. Armstrong,et al.  Nutritionally-induced anestrus in gilts: metabolic and endocrine changes associated with cessation and resumption of estrous cycles. , 1987, Journal of animal science.

[20]  R. Parr,et al.  Overfeeding during early pregnancy reduces peripheral progesterone concentration and pregnancy rate in sheep. , 1987, Journal of reproduction and fertility.

[21]  E. Hafez,et al.  Studies on the breeding season and reproduction of the ewe Part I. The breeding season in different environments Part II. The breeding season in one locality , 1952, The Journal of Agricultural Science.

[22]  E. Hafez,et al.  Studies on the breeding season and reproduction of the ewe Part III. The breeding season and artificial light Part IV. Studies on the reproduction of the ewe Part V. Mating behaviour and pregnancy diagnosis , 1952, The Journal of Agricultural Science.