The use of milk progesterone profiles to characterise components of subfertility in milked dairy cows

Milk progesterone (P 4) concentrations of 1682 postpartum (PP) dairy cows during 2503 lactations were used to define and quantify the incidence of atypical ovarian patterns and to assess their impact on reproductive performance. A total of 257 animals (10.94%) with their first significant luteal act...

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Bibliographic Details
Published in:Animal reproduction science 1998-09, Vol.52 (3), p.175-190
Main Authors: Lamming, G.E, Darwash, A.O
Format: Article
Language:English
Subjects:
Animals
Anovulation - veterinary
ARTIFICIAL INSEMINATION
Cattle
Cattle Diseases - metabolism
Cattle endocrinology
Corpus Luteum - physiology
DAIRY COWS
Female
Infertility, Female - veterinary
INSEMINACION ARTIFICIAL
INSEMINATION ARTIFICIELLE
Insemination, Artificial - veterinary
LACTACION
LACTATION
LAIT
LECHE
MILK
Milk - chemistry
OVULACION
OVULATION
PERFORMANCE DE REPRODUCTION
PROGESTERONA
PROGESTERONE
Progesterone - analysis
REPRODUCTIVE PERFORMANCE
REPRODUCTIVIDAD
VACAS LECHERAS
VACHE LAITIERE
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Summary:Milk progesterone (P 4) concentrations of 1682 postpartum (PP) dairy cows during 2503 lactations were used to define and quantify the incidence of atypical ovarian patterns and to assess their impact on reproductive performance. A total of 257 animals (10.94%) with their first significant luteal activity after day 44 PP were considered a result of delayed ovulation type I (DOVI). Prolonged luteal activity (P 4>3 ng/ml for at least 19 days) observed in 170 (7.3%) and 161 (6.35%) animals during first and subsequent cycles was considered a result of the presence of a persistent corpus luteum (CL), respectively denoted as PCLI and PCLII. Following the demise of an oestrous cycle CL, a total of 322 (12.85%) animals showed a delayed ovulation Type II (DOVII) with P 412 days. In 238 inseminated animals (9.92%) prolonged luteal activity was followed by the CL demise which may indirectly indicate the incidence of a late embryo to early foetal mortality (LEM). In this study animals during 794 (31.7%) lactations had at least one atypical ovarian pattern before insemination that, in comparison to those with typical P 4 patterns, contributed to a delayed conception (88.2 vs. 106.2 days), higher number of services per conception (1.49 vs. 1.8), lower first service conception rate (60.9 vs. 43.7%) and a reduced total conception rate (92.6 vs. 82.1%), all of which were significantly different at P
ISSN:0378-4320
1873-2232
DOI:10.1016/S0378-4320(98)00099-2