Testicular growth and comb and wattles development in three Italian chicken genotypes reared under freerange conditions

Autor: Chiara Rizzi, Rina Verdiglione
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Italian Journal of Animal Science, Vol 14, Iss 2 (2015)
Druh dokumentu: article
ISSN: 1594-4077
1828-051X
DOI: 10.4081/ijas.2015.3653
Popis: Male chickens belonging to three Italian purebreds – Ermellinata di Rovigo (ER), Robusta lionata (RL) and Robusta maculata (RM) – were studied. All the birds were reared under the same rearing conditions (from May until autumn). Chickens were reared under infra-red lamps from birth until 4 weeks of age with a 24L:0D photoperiod. Then they were kept outdoor: the photoperiod changed according to the season (from 16L:8D to 12L:12D). At 138 and 168 days of age 20 birds/breed were weighed and then slaughtered. Testicular samples were collected, after evisceration, processed and embedded in paraffine wax. Sections were stained for morphological observations, observed with light microscope, and then classified according to the testis maturation stage. Ermellinata di Rovigo chickens showed the lowest (PRobusta maculata showed a significant correlation between testes weight and comb (P
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