Effects of different estrous synchronization protocols on estrus and subsequent fertility in cycling cows

Title: Effects of different estrous synchronization protocols on estrus and subsequent fertility in cycling cows

Authors: Amit Kumar, JS Mehta, Swati Ruhil and GN Purohit

Source: Ruminant Science (2018)-7(1):83-86.

Cite this reference as: Kumar Amit, Mehta JS, Ruhil Swati and Purohit GN (2018). Effects of different estrous synchronization protocols on estrus and subsequent fertility in cycling cows. Ruminant Science 7(1):83-86.

 Abstract

Present study was conducted on 53 healthy cyclic cow of 2-5 parity and >90 day postpartum to evaluate the efficacy and subsequent fertility of three estrus synchronization protocols i.e. CIDR-PG (n=13), Ovsynch (n=15), Heatsynch (n=15). The animals of control group (n=10) remained untreated. After end of the protocol all the treated cows were observed daily morning-evening for 7 days for the occurrence of signs of estrus and inseminated artificially 12 to 18 hrs after the onset of estrus. Cohort development of developing follicles (5 mm) was monitored by ultrasonography and revealed that mean total no. of follicles on the left, right and both the ovaries recorded were not significantly different between the protocols. The mean diameter of the dominant follicle showed significant difference between the groups. Mean duration of onset of estrus post protocol was shortest in ovsynch protocol (27.46±0.97 h) whereas mean duration of estrus was significantly longer in CIDR-PG protocol (23.53±0.96 h). All the inseminated but not returned cows were scanned ultasonographicaly or examined manually through rectum for the confirmation of pregnancy at 35 and 60 days of pregnancy and revealed 60  conception rates in the heatsynch and ovsynch protocol whereas 54.54  in CIDR-PG based protocol.  It was concluded that among these estrous synchronization protocol heatsynch protocol was most effective for induction of estrus and expression of signs of estrus while ovsynch protocol as most effective in term of conception rate.

 References

Borakhatariya DN, Panchal MT, Dhami AJ, Hadiya KK and Kalasariya RM (2017). Efficacy of estrus synchronization protocols during summer and winter seasons together with biochemical and minerals profile in anoestrus crossbred cows. Indian Journal of Veterinary Science and Biotechnology 13:9-16.

Buhecha KV, Dhami AJ, Hadiya KK, Patel MD, Parmar SC and Killedar A (2015). Influence of different estrus synchronization protocols on fertility and plasma progesterone in anoestrus crossbred cows. Indian Journal of Animal Reproduction 36:1-5.

Cavalieri J, Hepworth G and Fitzpatrick LA (2005).Synchronising oestrus with oestradiol benzoate after using a two dose prostaglandin treatment to synchronise luteolysis in dairy heifers.  Australian Veterinary Journal 83:91-6.

Colazo MG and Ambrose DJ (2013). New research in controlled breeding programs for dairy cattle. WCDS Advances in Dairy Technology 25:75-95.

Dudi V, Mehta JS, Chaudhary AK, Kumar P, Kumar A and Ruhil S (2017). Efficacy of different estrus synchronizing protocols on estrus induction in postpartum lactating dairy cows. Ruminant Science 6(2):337-340.

Geary TW, Whittier JC, Downing ER, LeFever DG, Silcox RW, Holland MD, Nett TM and Niswender GD (1998). Pregnancy rates of postpartum beef cows that were synchronized using Syncro-Mate-B or the Ovsynch protocol. Journal of Animal Science 76:1523-1527.

Mahendran RR, Divakar JA, Julie AS and Nelson D (2001). Synchronization of estrus and ovulation in cattle. Arch TierzDummerstorf 44:58-67.

Mitharwal N, Mehta JS, Purohit GN, Saini J, Kajla MP, Kumar S and Gadhwal RS (2016). A comparative oestrus and fertility study on evaluation of three synchronization protocols. Veterinary Practitioner 17(2):225-226.

Patterson DJ, Kojima FN and Smith MF (1999). Addition of GnRH to a melengestrol acetate (MDA) estrus synchronization treatment improves synchrony of estrus and maintains high fertility in postpartum suckled beef cows. Journal of Animal Science 77 (Suppl. I):220.

Pursley JR, Mee MO and Wiltbank MC (1995). Synchronization of ovulation in dairy cows using PGF2alpha and GnRH. Theriogenology 44:915-23.

Rodgers JC, Bird SL, Larson JE, Dilorenzo N, Dahlen CR, Dicostanzo A and Lamb GC (2012). An economic evaluation of estrous synchronization and timed artificial insemination in Suckled beef cows. Journal Animal Science 11:4055-62.

Sa Filho OG, Dias CC, Lamb GC and Vasconcelos JL (2010). Progesterone-based estrous synchronization protocols in non-suckled and suckled primiparous Bos indicus beef cows. Animal Reproduction Science 119:9-16.

Snedecor SW and Cocharn SW (1994). Stastical Method. Iowa State University Press, USA.

Shukla MK and Garg A (2012). Efficacy of different route of administration and doses of dinoprost in estrus induction/ synchronization in subestrus murrah buffaloes. Ruminant Science 1(1):63-65.

Van Cleef J, Macmillan KL, Drost M,  Lucy MC and  Thatcher WW (1996).Effects of administering progesterone at selected intervals after insemination of synchronized heifers on pregnancy rates and resynchronization of returns to service. Theriogenology 46:1117-1130.

Zarkouny SZE (2010). Conception rates for standing estrus and fixed- time insemination in dairy heifers synchronized with GnRH and PGF2alpha. Turkish Journal Veterinary and Animal Science 34:243-248.