Periódicos Brasileiros em Medicina Veterinária e Zootecnia

Addition of tannin in lamb diets after weaning: impact on performance and hematological and biochemical variables

Lucianer, EduardoSilva, Aleksandro Schafer DaCazarotto, Chrystian JassanaAlba, Davi FernandoGriss, Luiz GustavoZampar, AlineVedovatto, MarceloKessler, Julcemar Dias

Background: In ruminants, the weaning period is a critical phase, because these young animals are allocated to variousfacilities and receive different feeds. Alternatively, supplements and additives can be used. The tannins are polyphenolsproduced by plants; constitute a group of complex secondary metabolic factors that inhibit the consumption by herbivoresor the development of microbial agents. The objective of this study was to determine whether the addition of condensedtannin extract from quebracho trees (Schinopsis lorentzii) in lamb diets after weaning would have beneficial effects ongrowth and health.Materials, Methods & Results: Forty lambs were assigned randomly to 1 of 4 treatments (10 lambs/treatment): T1 (0%;control), T2, T3, and T4 was 0.3, 0.6 and 0.9 % of quebracho extract in the diet, respectively. The T2 (0.3%) lambs hadgreater body condition scores (P = 0.005), and although they did not differ significantly, they had numerically greaterbody weight (P = 0.067) and weight gain (P = 0.072), than the control lambs. The anthelmintic and anticoccidial effectwas not possible to verify because no animals in any group were naturally infected by helminths or coccidia. The T4lambs had greater numbers of erythrocytes (days 10 and 40) [P < 0.05], greater hemoglobin concentrations (days 10and 40), and greater numbers of total leukocytes (day 10) as a result of greater numbers of neutrophil at the end of theadaptation period (day 10) compared to T1. The T3 and T4 lambs had greater (P < 0.05) serum total protein (days 10and 40) because of greater concentration of serum globulins (days 10 and 40) compared to T1, suggesting that the addition of tannin stimulated the immune system. The addition of quebracho in the diet affected serum concentrations ofglucose, triglycerides, and cholesterol at some times and treatments (P < 0.05). However, these changes did not followa pattern...(AU)

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