11/8/2022 0 Comments Chicken age progressionThe changes in the muscle used provide a basis for assessing the effects of drug treatments at various stages, including the early post-hatch period. The analyses show that some of the structural changes in D precede the discernible difference in fibre type composition which develops between D and N. The later stages in D, with gross loss of muscle fibres, are also described, in the pectoral and posterior latissimus dorsi muscles. Fibre splitting and phagocytosis become significant in D from about 2 weeks onwards and increase noticeably thereafter. Nuclei numbers and location change characteristically in D, compared to N, from about 4 days, and these differences subsequently become very prominent. Other abnormalities of fibre size and shape appear in D from about 2 weeks onwards. D shows fibre hypertrophy discernible from about 4 days after hatching. On our farm, we have found it’s best to transition over time rather than all at once. Make the transition gradually to prevent digestive upset. At the embryonic stage, fibroblast numbers (but not satellite cell numbers) are increased in D. Week 18: At what age do chickens start laying eggs When birds reach 18 weeks old or when the first egg arrives, slowly transition to a layer feed. A variety of indices of structural changes were used, to express the progression quantitatively. Dystrophic (D) and normal (N) chicken pectoral muscle was analysed for histopathological differences from the embryo (day 20) through to the mature adult stage.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |