Christian Hanzen

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BACKGROUND Haptoglobin and serum amyloid A are major acute phase proteins in cattle. Dairy cattle often develop pathologic conditions in the peripartum period; acute phase proteins may be useful in their diagnosis. OBJECTIVES The purpose of this study was to compare the accuracy of serum haptoglobin (Hp) and serum amyloid A (SAA) concentrations with(More)
One method to improve durably animal welfare is to select, as reproducers, animals with the highest ability to resist or tolerate infection. To do so, it is necessary to distinguish direct and indirect mechanisms of resistance and tolerance because selection on these traits is believed to have different epidemiological and evolutionary consequences. We(More)
Manual palpation or ultrasonographic examination of the cow's genital tract are currently used by veterinarians involved in reproductive management, but knowledge of the potential and the limitations of both methods is important to obtain an optimal accuracy in the diagnosis of physiological and pathological ovarian structures. This review presents the main(More)
The reproductive performance of Holstein x Lai Sind crossbred dairy heifers and cows was evaluated at smallholdings in Ho Chi Minh City (HCMC). The data of 232 heifers and 244 cows (261 lactations) from 35 small dairy farms was collected over a 2-year period, from 2013 to 2014. The overall mean for age at first service (AFS), days between first and last(More)
In dairy cattle, many farming practices have been associated with occurrence of mastitis but it is often difficult to disentangle the causal threads. Structural equation models may reduce the complexity of such situations. Here, we applied the method to examine the links between mastitis (subclinical and clinical) and risk factors such as herd demographics,(More)
The aim of this study was to assess the dose (300 to 600 IU) effects of equine chorionic gonadotropin (eCG) on the preovulatory follicle diameter, growth rate and time of ovulation characterized by echography. The eCG was injected at the end (D0) of the 7-day treatment with a controlled internal device release (CIDR®) and a PGF2α being injected 2 days(More)
This paper reports on a work in progress: an online self-instruction course created to stimulate students’ awareness processes when dealing with pictures. Using non-clinical material, the “Learning to Look” course was designed as a preliminary training to the observation of histological sections, radiological graphs, and other specialized visual material.(More)
Milk losses associated with mastitis can be attributed to either effects of pathogens per se (i.e. direct losses) or to effects of the immune response triggered by the presence of mammary pathogens (i.e. indirect losses). Test-day milk somatic cell counts (SCC) and number of bacterial colony forming units (CFU) found in milk samples are putative measures of(More)
Mounir ADNANE*, Rachid KAIDI, Christian HANZEN, Gary C.W. ENGLAND Higher National Veterinary School, Algiers, Algeria Institute of Veterinary Science, Ibn Khaldoun University, Tiaret, Algeria Institute of Veterinary Science, Laboratory of Biotechnology in Animals, University of Blida 1, Blida, Algeria School of Veterinary Medicine and Science, University of(More)
La radiothérapie antalgique des métastases osseuses de première intention est un traitement efficace quel que soit le fractionnement (traitement mono- ou plurifractionné). La radiothérapie peut également être proposée en cas d’échec ou d’efficacité insuffisante d’une première irradiation (après avoir éliminé une fracture) ou l’apparition de nouveaux sites(More)