Evaluation of water melons as a source of water, and watermelon seeds and acacia pods as a protein supplement for dairy cows in central Tanzania

acacia tortilis alimentacion complementaria alimentation des animaux alimentation individuelle animal feeding besoin en eau bulls cenchrus ciliaris chemical composition citrullus lanatus composition chimique conservation des sols dairy cows degradation developing countries feed intake feed supplements individual feeding milk yield necesidades de agua nutritive value prise alimentaire (animaux) proteine vegetale rendement laitier rendimiento lechero semiarid zones soil conservation suplementos de piensos supplementary feeding taureau toro tortas de girasol tourteau de tournesol vacas lecheras valeur nutritive valor nutritivo water requirements watermelons zebu zebu cattle