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Prestasie van zeranol geïnplanteerde lammers
Abstract
Twee groepe van vier maande oue Suid·Afrikaanse Vleismerino's bestaande uit 18 ramlammers en 18 hamellammers is respektiewelik elk in twee groepe, A en B vir die ramlammers en C en D vir die hamellammers volgens massa gestratifiseer. Die lammers in groepe A en C is elk met 12 mg zeranol geïnplanteer. Die lammers is individueel gevoer en gedurende 'n ses weke proefperiode is die gemiddeldedaaglikse toename (GOT); voerinname, voeromset, winsmarge en gradering bepaal. Geen betekenisvolle zeranol behandelingsverskille (p >0,05) is verkry nie. Die geiiJplanteerde hamellammers het egter beter waardes vir al die parameters getoon as die kontrole hamellammers. Die ramlammers het hoogsbetekenisvol (p<0,0I) vinniger gegroei en betekenisvol (p<0,05) meer voer as die hamellammers ingeneem. Behandeling van hamellammers het gedeeltelik die gaping tussen hamellammers en ramlammeis oorbrug.
English Title: Performance of zeranol implanted lambs
English Abstract
Eighteen South African Mutton Merino ram lambs, four months old were divided by mass stratification into two groups, (A and B), similarly 18 wether lambs of the same age and breed were divided into groups C and D. The lambs in group A and C were each implanted with 12 mg zeranol. The lambs were fed individually and during a six week experimental period average daily gain (ADG) feed ingested, feed conversion, profit and carcass grading were determined. Zeranol treatment had no significant (p >0,05) effect although the implanted wether lambs showed improved values for all parameters investigated. The ram lambs had a significantly (p <0,01) higher ADG and ingested significantly (p< 0,05) more feed than the wether lambs. Zeranol treatment of wether lambs tended to reduce the difference between wether and ram lambs.