In:
Reproduction in Domestic Animals, Wiley, Vol. 51, No. 4 ( 2016-08), p. 467-473
Abstract:
Objectives were to determine associations between percentage pregnancy loss ( PPL ) in dairy cattle and: (i) pregnancy diagnosis by ultrasonography; (ii) pregnancy diagnosis by serum pregnancy‐specific protein B ( PSPB ) concentrations, with or without serum progesterone concentrations; and (iii) production and environmental factors. This study included 149 822 pregnancy diagnoses conducted over 13 years in Holstein‐Friesian cows in Hungarian dairy herds. The following were determined: PPL in cows diagnosed pregnant by transrectal ultrasonography 29–42 days after artificial insemination ( AI ; n = 11 457); PPL in cows diagnosed pregnant by serum PSPB 29–35 days after AI (n = 138 365); and PPL and its association with serum progesterone concentrations, PSPB and production/environmental variables. The definition of PPL was percentage of cows initially diagnosed pregnant based on ultrasonography or PSPB , but not pregnant when examined by transrectal palpation 60 –70 days after AI . The PPL was lower (p 〈 0.001) in cows following ultrasonographic vs PSPB diagnosis of pregnancy at 29–35 days (8.1 vs 19.3%, respectively), but was higher in cows following ultrasonographic pregnancy diagnosis on 29–35 vs 36–42 days (8.1 vs 7.1%, respectively, P 〈 0.05). Furthermore, 72.9% of pregnancies with ultrasound‐detected morphological abnormalities resulted in pregnancy loss. As a subset of PSPB data, a fully quantitative PSPB assay was used for 20 430 samples; PPL in cows with a high PSPB concentration ( 〉 1.1 ng/ml) was lowest (15.0%), whereas cows with low concentrations of both PSPB and progesterone (0.6–1.1 and 〈 2 ng/ml, respectively) had the highest PPL (76.3%; p 〈 0.0001). Furthermore, PPL was higher in cows with advanced parity and with high milk production, when ambient temperatures were high, although body condition score ( BCS ) had no effect on PPL . Finally, there were no significant associations between serum PSPB and environmental temperatures or number of post‐partum uterine treatments.
Type of Medium:
Online Resource
ISSN:
0936-6768
,
1439-0531
DOI:
10.1111/rda.2016.51.issue-4
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
2020494-2
SSG:
12
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