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Titolo:
THE USE OF MILK PROGESTERONE PROFILES TO CHARACTERIZE COMPONENTS OF SUBFERTILITY IN MILKED DAIRY-COWS
Autore:
LAMMING GE; DARWASH AO;
Indirizzi:
UNIV NOTTINGHAM,CATTLE FERTIL RES GRP,SCH BIOL SCI,DIV ANIM PHYSIOL LOUGHBOROUGH LE12 5RD LEICS ENGLAND
Titolo Testata:
Animal reproduction science
fascicolo: 3, volume: 52, anno: 1998,
pagine: 175 - 190
SICI:
0378-4320(1998)52:3<175:TUOMPP>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSTPARTUM HOLSTEIN COWS; ENERGY-BALANCE; REPRODUCTIVE-PERFORMANCE; OVARIAN ACTIVITY; LUTEAL-PHASE; OVULATION; FERTILITY; CATTLE; INTERVAL; HEIFERS;
Keywords:
CATTLE ENDOCRINOLOGY; MILK; PROGESTERONE; REPRODUCTIVE PERFORMANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
G.E. Lamming e A.O. Darwash, "THE USE OF MILK PROGESTERONE PROFILES TO CHARACTERIZE COMPONENTS OF SUBFERTILITY IN MILKED DAIRY-COWS", Animal reproduction science, 52(3), 1998, pp. 175-190

Abstract

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 ofdelayed 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) withP-4 < 3 ng/ml for > 12 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. 1065.2 days), higher number of services per conception (1.49 vs. 1.8), lower first service conception rate (60.9 vs. 43.7%) and areduced total conception rate (92.6 vs. 82.1%), all of which were significantly different at P < 0.001. The incidence of PCLI and PCLII before insemination resulted in a higher level of LEM. Milk progesterone monitoring offers an accurate and objective measurement of factors associated with PP ovarian activity which will assist in investigating the genetic and environmental factors affecting fertility. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 18:14:51