Avtor/Urednik		Kosec, M; Mrkun, J; Pogačnik, M; Juntes, P
Naslov		Reproduction characteristics of Istrian pramenka sheep breed and their crossbreeds
Prevedeni naslov		Reprodukcijske značilnosti ovc istrske pramenke in njihovih križank (Ovis domesticus)
Tip		članek
Vir		Slov Vet Res
Vol. in št.		Letnik 37, št. 1-2
Leto izdaje		2000
Obseg		str. 77-83
Jezik		eng
Abstrakt		In the reproductive season from 1st of September to 30th of November 5 rams of Istrian pramenka breed and 15 crossbred rams have been introduced into the flock with the 62 ewes of Istrian pramenka and 413 crossbred ewes. Fertility and fecundity rate were monitored on the basic of flock records (conception rate, lambing rate, No of lambs born). Average circumference of scrotum was 35.70 +- 1.80 cm, average ejaculate volume was 0.74 +- 0.69 ml, number of sperms 2.26 +- 0.99 x 10 6/mm3, total number of sperms was 1.52 +- 1.29 x 109, progressive motifity was 69.50 +- 10.63 % and morphological abnormalities were 14.65 +- 9.96 %. Conception rate in the first 17 breeding days was 36.52 % and 48.48 % between the day 18-34. 63.26 % ewes were lambing between day 9 and 21. The majority of the lambing per day was on the day 19 when 40(8.70 %) ewes were lambing. Average numbers of lambs per ewe in the flock were 1.44 +- 0.51. With the 96.77 % conceptions rate and 1.52 +- 0.57 lambs per litter result in the Istrian Pramenka, and the 96.85 % or 1.43 +- 0.50 lambs per litter result in the crossbreed sheep, compared with other breeds, we can easily claim that the said breeds have an average fertility and fecundity rate. The seasonal influence of breeding conditions in Slovenian Karst is expressed in Istrian Pramenka as well as in the crossbred sheep; less than half of the animals (based on the time of lambing) were in oestrus during the first half of September.
Izvleček		V tropu 475 ovc, od katerih jih je bilo 62 pasme istrska pramenka in 413 križank, je v plemenilni sezoni, ki je trajala od 1. septembra do 30. novembra, plemenilo 20 ovnov, od tega 5 pasme istrska pramenka in 15 križancev. Štiri tedne pred plemenilno sezono smo opravili pregled ovnov. Na podlagi časa jagnjitve in števila jagnjet v gnezdu smo proučevali plodnost in rodnost ovc. Povprečen obseg modnika je znašal pri ovnih 35,70 +- 1,80 cm, volumen ejakulata 0,74 +- 0,69 ml, koncentracija semena 2,26 +- 0,99 x 106/mm3, skupno število semenčic v ejakulatu 1,52 +- 1,29 x 109, progresivno gibljivih je bilo 69,50 +- 10,63 % in morfološko nenormalnih semenčic 14,65 +- 9,96 %. V prvih 17 dnevih od začetka pripusta (1. ciklus) se je obrejilo 36,52 % ovc, od 18. do 34. dneva (2. ciklus) pa 48,48 %. Med 9. in 21. dnevom od začetka jagnjitev je kotilo 63,26 % živali. Največ jagnjitev je bilo 19. dan, ko je povrglo 40 živali (8,70 %). Povprečna velikost gnezda v tropu je znašala 1,44 +- 0,51 jagnjeta. S povprečno 96,77 % obrejitvijo in 1,52 +- 0,57 jagnjeta na gnezdo pri istrskih pramenkah in 96,85 % obrejitvijo in 1,43 +-0,50 jagnjeta na gnezdo pri križankah bi lahko rekli, da sta pasmi dobro plodni in povprečno v primerjavi z večino drugih. V prvi polovici septembra smo na podlagi časa jagnjitev ugotovili da je manj kot polovica živali v pojatvenem ciklusu. To kaže, da je v rejskih razmerah, kakršne so na slovenskem Krasu pri istrskih pramenkah kakor tudi pri križankah, prisoten vpliv sezone na pojatveni ciklus.
Deskriptorji		ANIMAL HUSBANDRY SEMEN PREGNANCY, ANIMAL SHEEP