Vanhatalo OE(1), Henderson JD(1), De La Torre U(1), Garrity CR(1), Pechanec MY(1), Mienaltowski A(2), King AJ(1), Mienaltowski MJ(3). Author information:
(1)Department of Animal Science, University of California Davis, Davis,
(2)Department of Psychological Sciences, Western Kentucky University, Bowling
Green, Kentucky, USA.
(3)Department of Animal Science, University of California Davis, Davis,
California, USA. Electronic address: [Email]
Significant improvements in genetics, nutrition, and food efficiency have had a great impact on the rapid growth of broilers, notably with increases in muscle mass. However, with rapid growth, the broiler industry has been negatively impacted by the increased incidence of myopathies, including white striping. White striping affects the pectoralis major muscle of broilers, particularly the larger breasts of rapidly growing modern commercial broiler lines. In this study, we documented the growth process of commercial broiler chickens from hatching to market weight at 6 wk. Gross pathology and histopathology analyses were performed on pectoralis major muscle collected weekly from birds culled from 1 to 6 wk. The severity of both gross and histologic pathologies in the breast muscle increased over time. White striping was initially observed at week 2, with a rise in the incidence and severity through the sixth week. Mild histopathology was noted in week 2, characterized by macrophage infiltration and limited phagocytosis of the muscle. Muscle condition deteriorated with age and weight gain, with more prevalent macrophages, phagocytosis, and interstitial fibroblasts. By week 5 and 6, there was severe myopathy including regions of obliterated muscle tissue. Linear regression models show a positive correlation between white striping, gross pathology, and histopathology relative to weight and age.
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