Boar genotype as a factor shaping age-related changes in semen parameters and reproduction longevity simulations
PBN-AR
Instytucja
Wydział Biologii i Hodowli Zwierząt (Uniwersytet Przyrodniczy we Wrocławiu)
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
THERIOGENOLOGY (35pkt w roku publikacji)
ISSN
0093-691X
EISSN
Wydawca
ELSEVIER SCIENCE INC
DOI
URL
Rok publikacji
2017
Numer zeszytu
Strony od-do
50-56
Numer tomu
98
Liczba arkuszy
Słowa kluczowe
angielski
Boar
Genotype
Reproductive longevity
Semen quality
Open access
Tryb otwartego dostępu
Otwarte czasopismo
Wersja tekstu w otwartym dostępie
Wersja opublikowana
Licencja otwartego dostępu
Inna
Czas opublikowania w otwartym dostępie
Razem z publikacją
Data udostępnienia w sposób otwarty
Streszczenia
Język
angielski
Treść
The aim of this study was a detailed analysis of the boar genotypes used in AI stations with an indication of their production capacity, including age and a precise analysis of their culling time and reason. The study included 334 boars: 81 Polish Large White (PLW), 108 Polish Landrace (PL), 49 Pietrain (P), 56 Duroc x Pietrain (D x P) and 40 Hampshire x Pietrain (H x P). Semen volume, spermatozoa concentration, total number of spermatozoa, number of motile spermatozoa, and number of insemination doses were analyzed. Quadratic regression was used to illustrate the selected sperm parameters at specific ages. Among all the studied boars the lowest motilities of spermatozoa were identified in white breeds PLW and PL, and the difference between motility extremes was 3.53% (P <= 0.01). The highest number of insemination doses were produced from D x P crossbreed boars: about 0.7 portions more compared to PL, 1.13 to PLW, 1.18 to H x P and 1.8 to P (all differences P <= 0.01). It has been shown in the case of ejaculate volume that for PLW and H x P boars the culling moment was far too early in terms of production capacity and differences were, respectively, 1635 ml for PLW and 12.61 ml for H x P. Based on the developed regression equations, the earliest maximum number of motile sperm (73.82 x 10(9)) was obtained by H x P crossbreed boars as early as at age 24 months. The highest values for this parameter were achieved, however, by other D x P crossbreed boars: 7430 x 10(9) at the later age of 32 months. A consequence of the high number of motile sperm in young H x P boars was that the theoretical maximum value of the number of AI doses was produced as early as the 14th month (25.59 portions). Curves of similar shape were obtained for PL and D x P boars; the difference in maximal values was 0.54 portions in favor of crossbreeds, at a later age of 7 months. It was noted that for PLW and D x P boars the highest number of cullings were due to reduced demand (24.47% and even 31.19%, respectively). Other boars - PL, P and H x P - were most frequently culled because of low semen values. Regardless of the genotype, high survival probabilities (over 0.96) were noted for the age of 12 months. The highest probabilities (still over 0.96) were noted in the longest time period (up to 18 months) for P boars. The results of our study can be used in AI stations as reference points for the exploitation and culling of boars with different genotypes.
Inne
System-identifier
PX-596c7013d5deefea6cb692b0
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