Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias
Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias
Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias
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16 t h International Congress on Animal <strong>Reproduction</strong><br />
Poster Abstracts 41<br />
analogous one of the GnRH, was beneficial for resolution of this<br />
pathology.<br />
P040<br />
Bull and sire effect for the pregnancy rate and embryonic<br />
loss <strong>in</strong> dairy cow<br />
Gabor, G 1 *, Balogh, OG 1 , Abonyi-Toth, Zs 2 , Toth, F 1 and Sasser, RG 3,4<br />
1Department of Cattle Breed<strong>in</strong>g Research Institute for Animal Breed<strong>in</strong>g, H-<br />
2053 Herceghalom, Hungary, 2 SzIE-AOTK, H-1074 Budapest, Hungary,<br />
3Department of Animal and Veter<strong>in</strong>ary Science, University of Idaho and<br />
4BioTrack<strong>in</strong>g LLC, 105 E. 2nd, Moscow, ID, USA<br />
Introduction The ma<strong>in</strong> limit<strong>in</strong>g factors of reproductive performance<br />
<strong>in</strong> dairies are pregnancy rate (PR) (<strong>in</strong>fluenced by embryonic loss<br />
(EL)) and number of services per conception (NSC). Between 1st<br />
January and 31st October 2007 our laboratory checked early<br />
pregnancies of approximately 11200 AI’s. That required collect<strong>in</strong>g<br />
data from cows of 13 dairies. PR and NSC seemed to be affected by<br />
the AI sire is why data were collected on the AI sires on the farm too.<br />
We also recor<strong>de</strong>d ovarian treatments of cows before AI, pregnancy<br />
rates and embryonic losses <strong>in</strong> cows. Our ma<strong>in</strong> goal was to check sire<br />
and bull effect for PR and EL. Based on the above mentioned data<br />
statistical analyses were carried out to f<strong>in</strong>d out <strong>in</strong>teractions between<br />
PR and EL with other factors (farm, ovarian treatment, age, number of<br />
AI).<br />
Materials and methods Blood samples were collected once a week,<br />
30-36 days post <strong>in</strong>sem<strong>in</strong>ation (PI), and sent to the laboratory by<br />
overnight mail. Data about the cow and AI were sent via email.<br />
BioPRYN ® ELISA test (BioTrack<strong>in</strong>g, Moscow, ID, US) was run for<br />
<strong>de</strong>tection of early pregnancy. All open cows and pregnant cows which<br />
had low optical <strong>de</strong>nsity values (close to the cutoff) dur<strong>in</strong>g the BioPryn<br />
test were assayed for serum P4 concentration. P4 was checked by an<br />
ELISA test (QuantiCheck, Veter<strong>in</strong>org, Budapest). Re-check of<br />
pregnancy status was done 60-90 days PI by rectal palpation.<br />
Differences between the early and 60-90 days pregnancy <strong>de</strong>tection<br />
were called late loss. Pearson's Chi-squared test and logistic<br />
regression was used to f<strong>in</strong>d the association among the data. Data from<br />
AI bulls (AIB) and the bull’s sires (BS) which had more than 100<br />
AI’s, and fathers of cows (FC) whose daughters had more than 100<br />
AI’s were used for statistical analysis.<br />
Results and discussion Significant correlation (P