Proteingehalt im Samenplasma von Zuchtebern auf den Betrieben für intensive Schweineproduktion in Serbien

The aim of this study was to investigate: (a) seminal plasma protein content in the Land-race (n = 38), Large White (n = 44) and Duroc (n = 24) boars breed, as well as boars distribution according to protein content in seminal plasma, and (b) the sperm motility in the semen samples, forming from the ejaculates with high or low protein content, stored in vitro on 17°C for 3 days. Not significant (p > 0.05) differences was found in seminal plasma protein content between three boar breeds. Only 31% of the 106 investigated boars had > 3.6% protein in seminal plasma. Progressive motility was significantly higher (p lt 0.01) in the ejaculates with high, compared to the ejaculates with low protein content (82% vs. 76%). After 3 days of storage, in thel:4 dilution proportion, the average progressive motility was significantly (p lt 0.01) decreased in relation to this value in native semen from the boars with high (82% to 64%), as well from the boars with low protein content in seminal plasma (76% to 48%). However, the average diluted semen progressive motility was significantly greater (p lt 0.01) in the boars with high (64%), compared to the boars with low protein content in seminal plasma (48%). The number of good diluted semen samples (>65% progressive motility), was also significantly (p lt 0.01) greater in the boars with high (41%), compared to the boars with low protein content in seminal plasma (12%)

Influence of ovsynch-treatment on concentration of progesterone in blood serum and pregnancy rates after artificial insemination in cows [Einfluss einer Ovsynch-Behandlung auf die Progesteronkonzentrationen im Blutserum und Trächtigkeitsraten bei Kühen na

Fertiliy rate in high milk-yield dairy cows, with prolonged postpartum anestrus, was investigated after treatment by Ovsynch protocol. Thirty cows with follicular cysts or unovulated follicles (around 1.2 cm in diameter), without detected estrus up to 60 days post partum, were treated by Ovsynch protocol. The date of the first GnRH injection was defined as day 0. On day 6. was given prostaglandin F2α (PGF2a) and second GnRH injection 48 h after PGF2 α (day 8). All treated cows were terminally inseminated at day 9 (without estrus detection), i.e. 12-14 h after the last GnRH injection. The blood serum progesterone concentration was determined by ELISA method, in blood samples taken from v. jugularis, at the day of AI.The blood serum concentration of progesterone on the day of AI was low in Ovsynch treated (1.8 ng/mL) and in control cows (1.5 ng/mL). Obtainedcalving rate was not significant different between treated and control cows (57:60%, respectively, p > 0.05). Our results show that Ovsynch protocol treatment can be a successful method for control of prolonged postpartum anestrus in high milk-yield cows