Effect of a soy protein concentrate and two energy sources as milk substitutes on productive performance nubian kids

The objective of this work was to evaluate the inclusion of a concentrate of soy protein and two energy sources as milk substitutes on productive performance of Nubian kids from birth to weaning, managed at the Goat Unit of the Faculty of Agronomy, Universidad Autonoma de San Luis Potosi, Mexico. Sixty eight kids (35 females and 33 males) were randomly assigned to the treatments : T-1 : lactic protein + cow lard, T-2 : 20.0% of concentrate of soy protein + cow lard, T-3 : 40.0% of concentrate of soy protein + cow lard, T-4 : lactic protein + pork lard, T-5 : 20.0% concentrate of soy protein + pork lard and, T-6 : 40.0% of concentrate of soy protein + pork lard. The concentrate of soy protein did not affect (P > 0.05) neither the consumption of liquid diet nor average daily weight gain, but it affected (P < 0.05) consumption of the starting concentrate (95; 95, and 97 g d(-1) animal(-1)). The energy sources did not affect (P > 0.05) neither consumption of the liquid diet nor average daily weight gain, but they affected (P < 0.05) consumption of the starting concentrate (97 vs 95 g d(-1) animal(-1)). Sex of kid did not affect (P > 0.05) neither consumption of the milk substitute nor average daily weight gain, but it affected (P < 0.05) consumption of the starting concentrate (100 vs 92 g d(-1) animal(-1) for males and females, respectively). The experimental period (weeks) affected (P <.05) all variables. The levels of the concentrate of soy protein, energy sources, and sex of kids did not affect (P > 0.05) feed conversion based on milk total solids. There were some significant interactions (P < 0.05) on consumption of the milk substitute and starting concentrate. It is concluded that it is possible to raise kids with milk substitutes prepared with a concentrate of soy protein, cow and/or pork lard.