Session 42
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Session 42
Poster 10
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EAAP – 62nd Annual Meeting, Stavanger 2011
287
The effect of castration at 10 months of age on growth physiology of Serrana de Teruel cattle breed Sanz A.1, Albertí Albertí P.1, Ripoll G.1, Blasco I.1, Álvarezlvarez-Rodrí Rodríguez J.2, 1
CITA de Aragon, Avda. Avda. Montañ Montañana 930, 50059 Zaragoza, Spain (
[email protected] (
[email protected])) 2 Universitat de Lleida,, Avda.. Rovira Roure 191, 25198 Lleida,, Spain Lleida Avda Lleida
OBJECTIVE ST
To compare performance and peripheral IGFIGF-I concentration of steers and bulls from 10 (surgical castration) to 21 months old (slaughter), with the aim of studding studding IGFIGF-I functions as nutritional status indicator and/or growth response mediator to endogenous estrogens strogens and androgens. e
MATERIAL AND METHODS - 14 male calves managed under a feeding programme divided in 3 phases: I) 1010-13 months: ad lib concentrate (93% DM, 11.7 MJME/kg DM) + ad lib straw
BULLS
II) 1414-18 months: 3 kg concentrate + ad lib barley silage (38% DM, 9.5 MJ ME/kg DM) III) 1919-21 months: ad lib concentrate + ad lib straw - Measurements: feed intake daily on a group basis and individual livelive-weights (LW) weekly - Blood samples monthly to analyze IGFIGF-I concentration by a commercial kit (CIA) STEERS
RESULTS (a, b indicate significances differences (P
