Review on mechanisms of dairy summer infertility and implications for hormonal intervention
Journal Title: Open Veterinary Journal - Year 2015, Vol 5, Issue 1
Abstract
In dairy cows and buffaloes, summer heat stress (HS) reduces milk yield and delays return to pregnancy leading to financial loss. Clues for effective interventions against summer infertility (SI) lie in understanding the underlying mechanisms. This article reviews current knowledge on the mechanisms of bovine SI and their implication for hormonal management. Under HS dairy animals encounter anestrous, silent cycles and repeat breeding which extend their open period. These effects are attributed mainly to HS induced disturbances in luteinizing hormone (LH) secretion, follicular dominance and estrogen secretion, ovulation and oocyte competence, luteal development and progesterone secretion, utero-placental function and embryo-fetal development. Hormonal timed artificial insemination protocols and LH support around estrous improved summer pregnancy rates by avoiding need for estrus detection, assisting follicular development and ovulation, enhancing quality oocytes and stimulating luteal function. Progesterone supplementation to enhance embryonic development did not produce significant improvement in summer pregnancy rates. There is need for evaluating integrated approaches combining hormones, metabolic modifier and cyto-protective agents.
Authors and Affiliations
B. U. Wakayo| College of Veterinary Medicine-Jigjiga University, P.O.Box 1020, Jigjiga Ethiopian Somali Regional State, Ethiopia, P. S. Brar| Deptartment of Veterinary Gynaecology and Obstetrics, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141 004, India, S. Prabhakar| Deptartment of Veterinary Gynaecology and Obstetrics, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141 004, India
Keywords
Related Articles
- EP ID EP9323
- DOI -
- Views 450
- Downloads 27
Metabolic and adaptive immune responses induced in mice infected with tissue-dwelling nematode Trichinella zimbabwensis
Tissue-dwelling helminths are known to induce intestinal and systemic inflammation accompanied with host compensatory mechanisms to counter balance nutritional and metabolic deficiencies. The metabolic and immune respo...
Electrochemotherapy increases local control after incomplete excision of a recurring penile fibrosarcoma in a stallion
An eleven-year-old stallion was referred for adjuvant treatment of an incompletely excised, recurring penile fibrosarcoma. The horse was bright, alert and responsive with a 15 x 12 cm ulcerated lesion on the ventral sid...
Clinical management of dietary induced urolithiasis associated with balanoposthitis in a Boer goat
A Boer-Kajang cross male goat was presented to the Veterinary Hospital, University Malaysia Kelantan with a history of dysuria, hematuria and restlessness. The goat was intensively managed (confined to the pen) and fed...
The eye of the Barbary sheep or aoudad (Ammotragus lervia): Reference values for selected ophthalmic diagnostic tests, morphologic and biometric observations
The purpose of this study was to describe the normal ocular anatomy and establish reference values for ophthalmic tests in the Barbary sheep or aoudad (Ammotragus lervia). Aoudad eyes are large and laterally positioned...
Inter relationship between some routine semen evaluation parameters in Jersey X local hill cattle crossbred bulls
The present study was conducted with an objective of establishing a relationship between various routine semen evaluation parameters. Work was conducted at Sperm Station Palampur, Himachal Pradesh, on the semen from fiv...