Advanced search
Start date
Betweenand
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sarcoplasmatic and myofibrillar protein changes caused by acute heat stress in broiler chicken

Full text
Author(s):
Santos, Carolina de Castro ; Delgado, Eduardo Francisquine ; Menten, José Fernando Machado [3] ; Pedreira, Aparecida Carla de Moura ; Castillo, Carmen Josefina Contreras ; Mourão, Gérson Barreto ; Brossi, Camila ; Silva, Iran José Oliveira da
Total Authors: 8
Document type: Journal article
Source: Scientia Agricola; v. 65, n. 5, p. 453-458, 2008.
Field of knowledge: Agronomical Sciences - Animal Husbandry
Abstract

Acute heat stress (AHS) modifies the structure of myofibrils affecting functional properties of meat, mainly the water holding capacity. This experiment aimed to identify changes in proteolysis and migration between the myofibrillar and sarcoplasmatic fractions due to pre-slaughter AHS. Myofibrillar fragmentation index (MFI), SDS-PAGE, western blot of vinculin (WB) and shear force (SF) were determined. Six hundred broilers (Gallus gallus) were slaughtered in three different days (ST). In each ST, groups of ten animals were placed in transport crates and submitted to AHS (35ºC, 75 - 85% RH) for 2 hours. Simultaneously, the non-stressed broilers (NS) were kept in thermoneutral environment (22ºC, 83 ± 6.6% RH) within the crates in the same density. After slaughter, the breast muscles were kept refrigerated until the withdrawal of all samples (0, 1, 2, 6 and 24 hours after slaughter). Sampling within AHS and NS birds was collected according to lightness value (normal L* < 49, and high > 51), except for determination of MFI and SF. The lightness was used later to perform SDS-PAGE and WB analyses. MFI kinetics showed that the fragmentation rate was superior in animals NS, indicating that AHS can harm proteolysis and rate of myofibrillar fragmentation. However, the extent of fragmentation did not change, as well as SF values. SDS-PAGE for Troponin fragments indicated a differentiated pattern between AHS and NS. The WB did not show alterations in vinculin fragmentation. Modifications in sarcoplasmatic fraction are observed in meat with high L*values, independent of environmental condition. (AU)

FAPESP's process: 04/06990-3 - Chicken meat quality: genetics, pre-slaughter and nutrition factors
Grantee:José Fernando Machado Menten
Support Opportunities: Research Projects - Thematic Grants