Effect of increasing forage in feedlot diets on feed intake, time spent ruminating and carcass quality
Abril Mejía, Ricardo Sebastián

Fecha: 2018
Descripción: 21 p.
Resumen: An experiment was conducted to ascertain the effects of increasing forage in feedlot diets on feed intake, time spent ruminating and carcass quality. Twenty-four Simmental heifers were blocked in four body weight groups (260, 241, 230, and 209 kg). Each group had 6 heifers, which were randomly assigned to 1 of 2 experimental treatments. There were in total 12 heifers per treatment. The experiment was performed in 4 periods, with 28 days per period. During the last week of each experimental period, measurements and samplings were made for further analysis. Treatment diets consisted of total mixed rations with two main ingredients, a concentrate and a forage source: a) barley straw at 10% of inclusion (BS 10%); b) alfalfa hay at 19% of inclusion (AH 19%). Diets were offered daily at 0900 on an ad libitum basis. Eating and ruminating behavior was video recorded for 24 h over three non-consecutive days in each experimental period and feed intake was controlled by means of feed bunks mounted on digital platform scales. In total 2,112 hours of video were analyzed. Results show that there were no significant differences in eating, ruminating and total chewing activities. The intakes of DM, DM from concentrate, NDF, and NDF from forage did not show differences among treatments, but DM from the forage was higher in AH 19% (P < 0. 001). These results are in agreement with the similar carcass quality recorded among animals, with a back fat score that tended to be greater in animals fed BS 10% in correspondence with the lower forage consumed by them.
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original. Creative Commons
Lengua: Anglès
Titulación: Qualitat d'Aliments d'Origen Animal [4313796]
Colección: Facultat de Veterinària. Treballs de màster i postgrau. Màster oficial de Qualitat d'Aliments d'Origen Animal
Documento: Treball de fi de postgrau
Materia: Aliments

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21 p, 2.3 MB

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