Biostimulation in primiparous postpartum acyclic early weaned beef cows: introducing the bulls at weaning advances cyclic rebreeding.
Rodolfo Ungerfeld
Abstract
Weaning and biostimulation promote an early cyclic postpartum rebreeding. Although the signals and mechanisms by which weaning and biostimulation differ, both end stimulating LH secretion. The aim of the experiment was to determine if weaning and biostimulation have additive effects advancing the postpartum rebreeding in primiparous postpartum anoestrous cows. The experiment was performed during late spring – early summer with 51 primiparous Hereford cows. Six weeks after parturition calves were weaned, and cows were managed in two experimental groups: WB (n = 22) and WDB (n = 29). Bulls were joined with WB cows at weaning, but joining was delayed one week in WDB cows. The presence of corpora lutea in the ovaries was recorded weekly with ultrasound, and 28 and 50 days after the end of the exposure period, pregnancy was determined by ultrasound. The percentage of cyclic cows was greater in WB than in WDB on Weeks 8 (36.4 vs 0 %), 9 68.2 vs 13.8 %), 10 (86.4 vs 27.6 %) and 11 (100.0 vs 37.9 %) (P < 0.001 in all). Cows that were weaned and biostimulated simultaneously rebred earlier than WDB cows (Week 9.1 ± 0.2 vs Week 11.0 ± 0.2; P < 0.0001). At the end of the experiment 46/51 (90.2%) of the animals were cycling. Pregnancy rate tended to be greater in WB than WDB cows 28 days after the end of the breeding period 18/22 vs 17/29, P = 0.077), but there was no difference at the end of the study (20/22 vs 24/29, ns). In conclusion, the application of weaning and biostimulation simultaneously advances postpartum rebreeding more than weaning alone in beef cows.
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References
Acosta B, Tarnavsky GK, Platt TE, Hamernik DL, Brown JL, Schoenemann HM, Reeves JJ. 1983. Nursing enhances the negative effect of estrogen on LH release in the cow. J Anim Sci, 57:1530-1536.
Alberio RH, Schiersmann G, Carou N, Mestre J. 1987. Effect of teaser bull on ovarian and behavioural activity of suckling beef cows. Anim Reprod Sci, 14:263-272.
Berardinelli JG, Joshi PS. 2005. Initiation of postpartum luteal function in primiparous restricted-suckled beef cows exposed to a bull or excretory products of bulls or cows. J Anim Sci, 83:2495-2500.
Delgadillo JA, Gelez H, Ungerfeld R, Hawken PAR, Martin GB. 2009. Revisiting the dogmas surrounding the mechanisms involved in the male effect in sheep and goats. Behav Brain Res, 200:304-314.
Fernandez DL, Berardinelli JG, Short RE, Adair R. 1996. Acute and chronic changes in luteinizing hormone secretion and postpartum interval to estrus in first-calf suckled beef cows exposed continuously or intermittently to mature bulls. J Anim Sci, 74:1098-1103.
Fiol C, Ungerfeld R. 2016. Positive effects of biostimulation on LH concentration and follicular development in anestrous beef heifers. J Anim Sci, 94:1-7.
Fiol C, Ungerfeld R. 2011. Biostimulation in cattle: stimulation pathways and mechanisms of response. Trop Subtr Agroec, 15 Suppl 1:S29-S45.
Geary TW, Whittier JC, Hallford DM, MacNeil MD. 2001. Calf removal improves conception rates to the Ovsynch and CO-Synch protocols. J Anim Sci, 79:1-4.
Landaeta-Hernández AJ, Giangreco M, Meléndez P, Bartolomé J, Bennet F, Rae DO, Hernández J, Archbald LF. 2004. Effect of biostimulation on uterine involution, early ovarian activity and first postpartum estrous cycle in beef cows. Theriogenology, 61:1521-1532.
Landaeta-Hernández AJ, Meléndez P, Bartolomé J, Rae DO, Archbald LF. 2006. Effect of biostimulation on the expression of estrus in postpartum Angus cows. Theriogenology, 66:710-716.
Martin GB, Kadokawa H. 2006. "Clean, green and ethical" animal production. Case study: reproductive efficiency in small ruminants. J Reprod Dev, 52:145-152.
Quintans G, Vázquez AI, Weigel KA. 2009. Effect of suckling restriction with nose plates and premature weaning on postpartum anestrous interval in primiparous cows under range conditions. Anim Reprod Sci, 116:10-18.
Silva Filho ML, Bezerra LR, Ferreira-Silva JC, Souto FM, Oliveira NR, Lima PF, Bartholomew CC, Oliveira MAL. 2015. Influence of biostimulation and temporary weaning on follicular dynamics and pregnancy rates in Nelore cows (Bos taurus indicus). Trop Anim Health Prod, 47:1285-1291.
Stagg K, Spicer LJ, Sreenan JM, Roche JF, Diskin MG. 1998. Effect of calf isolation on follicular wave dynamics, gonadotropin and metabolic hormone changes, and interval to first ovulation in beef cows fed either of two energy levels postpartum. Biol Reprod, 59:777-783
Tauck SA, Olsen JR, Wilkinson JRC, Berardinelli JG. 2010. Duration of daily bull exposure on resumption of ovulatory activity in postpartum, primiparous, suckled, beef cows. Anim Reprod Sci, 118:13-18.
Williams GL, Gazal OS, Guzman Vega GA, Stanko RL. 1996. Mechanisms regulating suckling-mediated anovulation in the cow. Anim Reprod Sci, 42:289-297.
Zalesky DD, Day ML, Garcia Winder M, Imakawa K, Kittok RJ, D’Occhio MJ, Kinder JE. 1984. Influence of exposure to bulls on resumption of estrous cycles following parturition in beef cows. J Anim Sci, 59:1135-1139.
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