PMID: 11928928Apr 4, 2002Paper

Reproductive parameters and efficiency of inseminators in dairy farms in Portugal

Reproduction in Domestic Animals = Zuchthygiene
A RochaJ Carvalheira

Abstract

This study was carried out to determine the reproductive efficiency indices of one of the largest dairy co-operatives of northern Portugal, using data from 1980 to 1998. Records were made available by the computerized National Recording System. Age at first calving was 32.0 +/- 6.0 months. Mean calving to first AI interval was 95.4 +/- 30.0 days, and calving to conception intervals decreased (p < 0.05) from 176.9 +/- 4.5 to 148.1 +/- 5.6 days from the first to the fourth/fifth parturitions, respectively. Calving intervals decreased (p < 0.05) from 418.1 +/- 3.4 to 392.5 +/- 7.0 days from the first to fourth/fifth parturitions, respectively. Mean non-return rates at 90 days for first inseminations was 71.7 +/- 6.5% and mean calving rates at first insemination was 51.4 +/- 8.1%. There were significant differences (p < 0.001) in the inseminators' efficiency, measured by both non-return and calving rates at first AI, with differences between the best and worst results of 13.3 and 16.1% for non-return and calving rates, respectively. The ranking of the inseminators did not coincide when their efficiency was measured by either non-return or calving rates. The mean number of inseminations per pregnancy (pregnant cows only) was 1.4 +/-...Continue Reading

References

Oct 1, 1990·Journal of Dairy Science·R O HarrisonA E Freeman
Jun 1, 1985·Journal of Dairy Science·J H Britt
Jul 1, 1985·Journal of Dairy Science·D A ColemanR A Dailey
Dec 1, 1982·Journal of Dairy Science·R A WestellL R Schaeffer
Apr 1, 1996·Australian Veterinary Journal·K L MacmillanC T Westwood
Jan 11, 1997·The Veterinary Record·R J Esslemont, M A Kossaibati
Mar 29, 2000·Theriogenology·M L Kinsel, W G Etherington
Apr 1, 1965·Journal of Dairy Science·J M WHITE, J R NICHOLS

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Citations

Jan 7, 2010·Reproduction in Domestic Animals = Zuchthygiene·A RochaJ Carvalheira
Jun 26, 2014·Animal Science Journal = Nihon Chikusan Gakkaihō·Christian LambertzMatthias Gauly
Oct 23, 2016·Theriogenology·Mahmoud S El-TarabanyElshimaa M Roushdy

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