Porcine Field Fertility with Two Different Insemination Doses and the Effect of Sperm Morphology

摘要: In swine artificial insemination, several dose regimens are applied, ranging from 1.5 x 10(9) to 6.0 spermatozoa per intra-cervical insemination dose. A lower sperm is more profitable for centres and offers a effective use of superior boars. To evaluate fertility, 50 boars were used total 10 773 homospermic first inseminations at 2 billion spermatozoa. addition, 96 3 34 789 inseminations. Fertility was determined by 60-day non-return rate (NR%) Litter size registered number piglets born separately in primiparous multiparous farrowings. On average, sow inseminated times. significant decrease observed all three fertility parameters (NR%, litter both farrowings) with compared The NR% 75.8% 84.0% (p < 0.001), the mean farrowings 10.1 10.7 0.001) 11.7 12.1 spermatozoa/dose, respectively. proportion normal morphology analysis correlated significantly regimens: p 0.001, r = 0.604 0.05, 0.223 These results confirm that quantity can least partly compensate poor quality. When <70% evaluation excluded data there no correlation between NR%. However, difference remained statistically favour bigger conclusion, on commercial farms will severely prolificacy under field conditions, where an average times/heat, semen typically within days after collection. We recommend circumstances doses contain <3 spermatozoa/dose.