Title of article :
Supplementation of Barbarine ewes with spineless cactus
(Opuntia ficus-indica f. inermis) cladodes during late gestation-early
suckling: Effects on mammary secretions, blood metabolites, lamb
growth and postpartum ovarian activity
Abstract :
This trial investigated effects of cactus incorporation in the diet of the late pregnant-early
suckling ewe on mammary gland secretions, blood metabolites, ovarian activity and lamb
growth. Thirty-four single bearing ewes of the Barbarine breed aged 4.4±1.7 years that
were oestrus synchronised were selected. Animals were allocated to either barley treatment
(n = 17) with daily feeding of 1.5 kg of oaten hay, 0.33 kg of barley and 0.11 kg of soybean
meal per ewe or to a cactus treatment (n = 17), with feeding of 1.5 kg of oaten hay, 3 kg of
cactus cladodes and 0.14 kg of soybean meal per ewe. The trial lasted approximately 60
days and started 4 weeks before lambing and continued until 30 days postpartum. Plasma
concentrations of phosphorus, total protein, glucose and insulin before and after lambing
slightly differed between ewes in both treatment groups and were more affected by
time relative to lambing. Ewes fed cactus had higher (P < 0.05) plasma levels of calcium
than their counterparts fed barley. Colostrum production did not differ between feeding
regimes. The colostrum immunoglobulin G concentrations averaged 160 and 149 g/l
(S.E.M. = 12.9) in the barley and cactus groups, respectively. Milk yield at day 10 and 30 from
birth was not affected by treatment (P > 0.05). Milk yield at 30 days was 1030 and 1041 g/day
(S.E.M. = 96.9) for barley and cactus, respectively. Lamb live weight at 10 days of age was,
respectively, 6.2 and 6.8 kg (S.E.M. = 0.23) for barley and cactus and identical (9.5 kg) at 30
days of age. The feeding regime did not affect ovarian activity at 30 days from lambing. It is
concluded that cactus can totally replace barley grain in the diet of late pregnant-early suckling
Barbarine ewes without affecting mammary secretions, resumption of ovarian activity
or lamb growth.