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Titolo:
Effect of health disorders on culling in dairy cows: a review and a critical discussion
Autore:
Beaudeau, F; Seegers, H; Ducrocq, V; Fourichon, C; Bareille, N;
Indirizzi:
INRA, Sch Vet, Unit Anim Hlth Management, F-44307 Nantes 03, France INRA Nantes France 03 it Anim Hlth Management, F-44307 Nantes 03, France INRA, Genet Quantitat & Appl Stn, F-78532 Jouy En Josas, France INRA JouyEn Josas France F-78532 ppl Stn, F-78532 Jouy En Josas, France
Titolo Testata:
ANNALES DE ZOOTECHNIE
fascicolo: 4, volume: 49, anno: 2000,
pagine: 293 - 311
SICI:
0003-424X(200007/08)49:4<293:EOHDOC>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
FINNISH-AYRSHIRE COWS; HOLSTEIN-FRIESIAN COWS; NEW-YORK-STATE; REPRODUCTIVE-PERFORMANCE; MILK-YIELD; SURVIVAL ANALYSIS; PRODUCTIVE LIFE; DISEASES; HERDS; CATTLE;
Keywords:
dairy cow; culling; health disorders; risk factors; survival analysis;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Beaudeau, F INRA, Sch Vet, Unit Anim Hlth Management, BP 40706, F-44307 Nantes 03, France INRA BP 40706 Nantes France 03 706, F-44307 Nantes 03, France
Citazione:
F. Beaudeau et al., "Effect of health disorders on culling in dairy cows: a review and a critical discussion", ANN ZOOTECH, 49(4), 2000, pp. 293-311

Abstract

Risk of culling consequent to the main health disorders occurring in the current production systems is reviewed. Survival analysis including health disorders as lime-dependent variables is considered to be the most appropriate method to assess their effects because they allow a better description of the exact follow-up of disease history. Farmers preferentially consider health events in the current lactation and/or those occurring in early stages of lactation for making culling decisions. The unfavourable direct effects on culling of dystocia and udder disorders (mastitis and teat injuries) are clearly demonstrated, whereas there ale variations between studies on the association between metabolic and reproductive disorders and culling. These variations may be due to differences in study designs, populations involved and methods. Consequences, in terms of estimated effect of health disorders, of methodological choices (e.g. whether or not including in the models descriptors for milk yield and/or reproductive performance) are discussed. Metabolic and reproductive disorders may act indirectly through a subsequent decrease in milk yield and reproductive performance. The impact of health disorders on longevity is on average weak;, compared to the impact of low milk yield potential and pool reproductive performance. Herd characteristics (availability of heifers, quota, farmer's attitude towards risk and uncertainty...) modify the risk for a cow to be culled for a given health disorder. Aims of further studies could be (1) to interpret the meaning and to analyse the reliability of culling reasons information, (2) to evaluate therelative effect on culling of health disorders and performance (milk yieldand reproduction) in different parities, (3) to investigate the role of components of the herd effect on the risk of culling.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 12:27:25