7-Title: Characterisation of ovarian steroidal hormones associated with delayed ovulation in Jersey crossbred cows
Authors: Akhter Rasool, T Sarath, K Krishnakumar, K Porteen and NR Senthil
Source: Ruminant Science (2023)-12(2):215-218.

Abstract

How to cite this manuscript: Rasool Akhter, Sarath T, Krishnakumar K, Porteen K and Senthil NR (2023). Characterisation of ovarian steroidal hormones associated with delayed ovulation in Jersey crossbred cows. Ruminant Science 12(2):215-218.
Abstract
The production potential of crossbred cattle is limited by inherent reproductive issues such as delayed ovulation and a low conception rate, which results in significant financial loss for farmers. Therefore, it is critically necessary to focus research on the development of a suitable diagnostic tool for detecting delayed ovulation in crossbred cattle. A total of 20 animals, comprising ten normal cyclical (Group I) and ten delayed ovulation (Group II) Jersey crossbred cows, were included in this study based on the owner’s history, rectal palpation, and ultrasonography. Blood samples were collected on day 0 (estrus), as well as on the 3rd and 4th days (post-estrus) from each group to assess the estradiol and progesterone profiles. Ultrasound screenings for ovulation were conducted regularly at 12-hour intervals for three consecutive days. All of the animals underwent gynaeco-clinical examination. Blood samples were collected during estrus from each group for estimation of estradiol and progesterone profile and ultrasound screening for ovulation was made regularly at 12-hour intervals. The estrogen concentrations decreased significantly (P<0.01), whereas the concentration of progesterone increased significantly from day 0 to day 4 of the oestrous cycle in normal cyclical cows. However, it was reported that group II cows had low estradiol and high progesterone concentrations, which most likely delayed the LH surge and led to delayed ovulation. The current study provides compelling evidence that alterations in progesterone and estradiol concentrations are a primary cause of delayed ovulation in Jersey crossbred cows. References Anitha A, Reddy Kapa, Ramana JV and Reddy PVV (2005). Body conditions score and its relation to age and physical parameters in crossbred cows. Indian Veterinary Journal 82:305-308. Cavalieri J, Rubio I Kinder JE Entwistle KW Fitzpatrick LA (1997). Synchronization of estrus and ovulation and associated endocrine changes in Bos indicus cows. Theriogenology 47:801-814. Duchens M, Forsberg M, Gustafsson H, Edqvist LE and Rodriguez-Martinez H (1995). Reproductive performance of heifers induced to estrus asynchrony by suprabasal plasma progesterone levels. Animal Reproduction Science 39:171-182. Duchens M, Rodriguez-Martinez H, Forsberg M and Gustafsson H (1996). Ultrastructure of bovine ovarian follicles induced to extended growth by perioestrus suprabasal progesterone levels. Acta Veterinaria Scandinavica 37:239-250 Hafez ESE and Hafez B (2000). Reproduction in farm animals. 7th Edn, KM Varghese Co Bombay, p 278. Hunter RHF (1994). In: Embryonic Mortality in Domestic Species. Eds: Zavy MT and Geisert RD. CRC Press, Boca Raton, pp 1-22 Kumar A and Singh U (2009). Fertility status of Hariana cows. Indian Veterinary Journal 86:807-809. Firdose, Bhattacharyya, Hiranya, Fazili Mujeeb, Hussain S and Khan Mohd Zaheen (2015). Studies on estrual cervical mucus of repeat breeding cows with special reference to ovulatory disturbances and genital infection. Theriogenology Insight – An International Journal of Reproduction in all Animals 5:113-118 Gustafsson H, Larsson K, Kindahl H and Madej A (1986). Sequential endocrine changes and behaviour during estrus and metestrus in repeat breeder and virgin heifers. Animal Reproduction Science 19:261-273. Layek SS, Mohanty TK, Kumaresan A, Behera K and Chand S (2013). Cervical mucus characteristics and periestrual hormone concentration in relation to ovulation time in Zebu (Sahiwal) cattle. Livestock Science 152:273-281 Manik R, Singla SK, Palta P and Madan ML (1998). Ovarian follicular dynamics monitored by real-time ultrasonography during oestrous cycle in buffalo (Bubalus bubalis). Asian-Australasian Journal of Animal Sciences 11:480-485. Noakes DE, Parkinson TJ and England GCW (2001). Arthur’s Veterinary Reproduction and Obstetrics. 8th Edn, pp 445-446. Sangsritavong S, Combs DK, Sartori R and Wiltbank MC (2002). High feed intake increases blood flow and metabolism of progesterone and estradiol – 17alpha in dairy cattle. Journal of Dairy Science 85:2831-2842. Singh B, Saravia F, Båge R and Rodríguez-Martínez H (2005). Pregnancy rates in repeat-breeder heifers following multiple artificial inseminations during spontaneous estrus. Acta Veterinaria Scandinavica 46:1-12.