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Efeito do sombreamento sobre os consumos de alimento e água em caprinos das raças Marota e Canindé. Texte intégral
2014
ARRUDA, F. de A. V. | KAWAS, J. R. | PANT, K. P. | SILVA, F. L. R. | SANTOS, J. W. dos | SHELTON, M.
The donkey as a draught power resource in smallholder farming in semi-arid western Zimbabwe. 1. Live weight and food and water requirements
1999
Nengomasha, E.M. | Pearson, R.A. | Smith, T.
Three experiments were undertaken to assess the Zimbabwean donkey. In the first study, 191 male and 144 female working donkeys from Matopos, Nkayi and Matobo districts were weighed. Age, sex and coat colour were recorded and heart girth, umbilical girth, body length and height were measured. There were no differences (P>0.05) in live weight, 142 and 141 kg, heart girth 115 and 115 cm, body length 89 and 90 cm and height 105 and 105 cm between males and females. This suggests that draught potential might be similar between the sexes. Heart girth was the best single predictor of live weight: live weight (kg) = heart girth (cm)2.83/4786 (R2 = 0.86). Donkeys were similar in size to others in Africa. In the second study, the voluntary dry-matter intake (DMI) of a poor quality hay was measured for 35 days in nine male (mean live weight 150 kg) and nine female donkeys (142 kg) allocated to one of three treatment groups: water available ad libitum, or given every 48 h, or every 72 h. There were significant differences in daily water (P<0.001) and DMIs (P<0.05): 8.5, 4.9 and 5.11 and 3.1, 2.8 and 2.7 kg for the three treatment groups, respectively. However even with restricted access to water, donkeys maintained a relatively high DMI. In the third experiment a 3 X 3 Latin square was designed with three teams of four male donkeys each, either working (5 h/day)/no access to food (5 h/day); not working/no access to food (5 h/day) or not working/access to food 24 h/day, for 63 days. For working and non-working donkeys, there were no significant differences (P>0.05) in DMI, DM apparent digestibility and mean retention time (MRT) of hay. Time of access to food did not influence DMI. The apparent lack of response was attributed primarily to the poor quality of the hay.
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