Effects of Lasia spinosa Thw. on growth rate and reproductive hormone of weaned Swamp buffalo and Murrah X Swamp buffalo calves

摘要

Abstract The effects of Lasia spinosa Thw. on growth rate and plasma Oestradiol 17-β (E₂), Progesterone (P4) and Testosterone (T) were studied in 16 male and female swamp (SS) buffaloes and Murrah x Swamp buffalo crossbreeds (MS) calves. The treatment group was fed with a concentrate supplemented with 30 g of dry powder of L. spinosa /head/d for 7 months. It was found that L .spinosa could have effect on male and female buffalo growth rate. The growth rate of male SS treated group were 130 g/d higher than control group. In female both SS and MS buffalo, the highest growth rate (830 to 840 g/d) was found after the 2nd month of treatment while a reduction in growth rate (-1,030 to - 450 g/d) was found in the 3rd month. After that the growth rate of SS and MS gradually increased until the last three months to 200 and 80 g/d in average, respectively. In female MS, plasma E₂ in the treated group was lower than control group during Jan to Jul. Similar result was found in SS female, level of plasma E₂ in treated group was lower than in control group in the first and last three month and there was no difference of plasma E₂ in May. In MS male, the level of plasma E₂ of treated group was higher than control group in Jan, Mar, Apr and Jul. In SS male, the level of plasma E₂ of treated group was higher than control group in every month except in Jul. In female SS , L. spinosa could decreased plasma P4 through the experiment and could not have an effect on plasma P4 in female MS and plasma T in male buffalo calves. In conclusion, the addition to the concentrate of dry powder of L. spinosa 30 g/headl/d had an effect to increase growth rate in male SS and female MS buffalo calves, decrease plasma E₂ in female both SS and MS and male SS and decrease plasma P4 in female SS.