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Increase of prolificacy in sheep immunized against androstenedione






Follicular growth and ovulation rate in farm animals A seminar in the CEC Programme of Coordination of Research in Animal Husbandry, held in Dublin, Ireland, on October 30-31, 1985: 129-133

Increase of prolificacy in sheep immunized against androstenedione

This discussion indicates that long lambing intervals and low ovulation rates are the 2 major factors which limit the fecundity of sheep flocks in Europe. To overcome these problems, a number of nutritional, genetic and physiological methods have been tried.


Accession: 001615188



Related references

Beghelli, V.; Boiti, C.; Castiglione, L.N.L.; Canali, C.; Ciavattella, U., 1988: The effect of active immunization against androstenedione on prolificacy in sheep. In 14 flocks, 419 ewes of several breeds were immunized against androstenedione by 2 injections of Fecundin 8 and 4 wk before mating. 358 untreated ewes served as controls. The av. litter size of treated and untreated ewes was 1.59 and 1.39 resp.,...

Wolf, B.T., 1986: Improvement of the prolificacy of sheep using active immunisation against ovarian steroid androstenedione. 188 Welsh Mule (WM; Bluefaced Leicester X Specklefaced [Beulah Speckled Face]) and 181 draft Specklefaced ewes were allocated to untreated control or treatment groups at random within breed, ewe age and condition score subclass. Treated ewes were...

Cameron, A.W.; Oldham, C.M.; Fairnie, I.J.; Keogh, E.J.; Lindsay, D.R., 1988: The number of spermatozoa, the number of ovulations per ewe, and immunization against androstenedione affect fertility and prolificacy of sheep. Ewes that were untreated, fed lupins or fed lupins and immunized against androstenedione were artificially inseminated. The percentage of ewes pregnant at 36-45 days after insemination (fertility) was 8% higher in ewes that had more than one ovula...

McNatty, K.P.; Hudson, N.L.; Gibb, M.; Collins, F.L., 1988: Plasma concentration of FSH, LH and progesterone in sheep immunized against an androstenedione-protein conjugate. Increases in the plasma concentration of FSH (P<0.05) and LH (P<0.001) were observed during the luteal (days 9-11) phase, but not during the subsequent cloprostenol-induced follicular phase in androstenedione-immunized ewes compared with cor...

McNatty, K.P.; Hudson, N.L.; Gibb, M.; Collins, F.L., 1988: Plasma concentrations of FSH, LH and progesterone in sheep immunized against an androstenedione-protein conjugate. A significant increase in the plasma concentrations of FSH (P less than 0.05) and LH (P less than 0.001) was observed during the luteal (Days 9-11) phase but not during the subsequent cloprostenol-induced follicular phase in androstenedione-immuni...

Scaramuzzi R.J.; Baird D.T.; Clark I.J.; Martensz N.D.; Van Look P.F.A., 1980: Ovarian morphology and the concentration of steroids during the estrous cycle of sheep actively immunized against androstenedione. Ewes were immunized against androstenedione-11.alpha.-hemisuccinyl-bovine serum albumin (androstenedione-11-BSA) or BSA alone (controls). The ovaries were macroscopically examined and ovarian venous blood was collected at laparotomy by in-situ can...

Scaramuzzi, R.J.; Baird, D.T.; Clarke, I.J.; Martensz, N.D.; Look, P.F.A. van, 1980: Ovarian morphology and the concentration of steroids during the oestrous cycle of sheep actively immunized against androstenedione. Ewes were immunized against androstenedione-11.alpha.-hemisuccinyl-bovine serum albumin (androstenedione-11-BSA) or BSA alone (controls). The ovaries were macroscopically examined and ovarian venous blood was collected at laparotomy by in-situ can...

Scaramuzzi, R.J.; Baird, D.T.; Clarke, I.J.; Martensz, N.D.; Van Look, P.F., 1980: Ovarian morphology and the concentration of steroids during the oestrus cycle of sheep actively immunized against androstenedione. Ewes were immunized against androstenedione-11 alpha-hemisuccinyl-bovine serum albumin (androstenedione-11-BSA) or BSA alone (controls). The ovaries were examined macroscopically and ovarian venous blood was collected at laparotomy by in-situ cann...

Lopyrin. A.I., 1937: The increase of prolificacy in the sheep by hormones. EXPERIMENTS were made on 380 crossbred Merino x Valahian sheep which were given an injection of 10-60 c.c. of pregnancy urine or 100-500 M.U. of total prolan 2-8 days before the onset of heat. On examining the ovaries of 146 experimental and contr...

Sirhan A.L., 1988: Increase in prolificacy in sheep focus on immunophysiology. Avances en Produccion Animal 13(1-2): 3-18