Naslov
Influence of geographical location change on onset of sexual activity in indigenous Pramenka of Lika sheep

Autori
Dovenska, Monika ; Vince, Silvijo ; Špoljarić, Branimira ; Nikolovski, Martin ; Dovenski, Toni ; Grizelj, Juraj

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings Days of Veterinary Medicine 2013 / Mitrov, Dine ; Pendovski, Lazo ; Perčinić, florina - Skopje : Faculty of Veterinary Medicine - Skopje, 2013, 131-132

ISBN
978-9989-774-25-6

Skup
Days of Veterinary Medicine 2013

Mjesto i datum
Struga, Sjeverna Makedonija, 06.09.2013. - 08.09.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
breeding season; environment; progesterone; Pramenka breed; Lika strain

Sažetak
Introduction Pramenka of Lika is an indigenous breed of sheep which is raised in the mountain areas of Lika and Gorski kotar in Croatia and it is the most typical strain of Pramenka sheep, with strong physical condition and resistant to illnesses. It is the source of income for the rural population of Lika and Gorski kotar and the production of cheese and lamb meat depends on the seasonal breeding and specific period of lambing of sheep. For this reason, management of herd’s reproduction at family households is of great importance. The aim of this study was to determine the onset of sexual activity and environmental influence in two consecutive breeding seasons, by measuring serum progesterone concentration (P4). Materials and Methods In the study, 8 sheep at age from 1.5 to 5.0 were brought at the Clinic for Obstetrics and Reproduction at the Faculty of Veterinary Medicine, Zagreb from a family household situated in Lika. Blood samples were taken in the period from 10.06.2011 until 05.09.2012, once a week and serum was extracted by centrifugation within 15 minutes from sampling. They were packed, labeled and stored at -20 °C in 2ml cuvettes until assessment. The P4 testing was made by Immulite®One automatic system. Results In the first year of study, the start of the breeding season was first recorded in one sheep in July, 23rd, 32 days after the summer solstice, which is considered to be the trigger of sexual activity in sheep. In August, 26th, cyclic activity was noted in another one. During September, serum P4 levels were elevated at 5th, 13th and 29th in one, three and one sheep, respectively. One sheep entered the breeding season as late as the 10th of October, 2011. Next year, ovarian cyclic activity was registered in 6 sheep in August, at 10th in one sheep, at 17th in two more, as well as the 24th and in one sheep at the very end of the month, 31st. Serum P4 levels showed cyclic activity of the ovaries in one sheep at 5th of September, 2012 and only one sheep did not establish ovarian cyclic activity. Conclusion Based on the results, we can conclude that the breeding season in the First year of study started two weeks later than the year after (∼ September, 8th vs. ∼August, 25th). Although this difference is not statistically signifi cant, it points out that the change of geographical location could postpone the start of sexual activity in Pramenka of Lika sheep.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

POVEZANOST RADA