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FEED ADDITIVES INCREASE INTAKE OF THE MOST IMPORTANT TANNIN- AND TERPENE-RICH SHRUBS IN THE MEDITERRANEAN MAQUIS
Jozo Rogošić
; Sveučilište u Zadru, Zadar, Hrvatska
Tomislav T. Šarić
; Sveučilište u Zadru, Zadar, Hrvatska
Mia Brkljača
; Sveučilište u Zadru, Zadar, Hrvatska
Jerko Pavličević
; Sveučilište u Zadru, Zadar, Hrvatska
Stanko Ivanković
; Agronomski fakultet, Sveučilite u Mostaru, Mostar, BIH
Sažetak
In six trials, the effect of energy (barley), polyethylene glycol (PEG; trials 1- 3), activated charcoal (Ach; trials 4 -6) and number of Mediterranean shrubs offered to sheep and goats was examined. Three shrubs with high tannin content were offered in trial 1, 2 shrubs in trial 2 and 1 shrub in trial 3, likewise 3 shrubs with a high terpene content in trial 4, 2 shrubs in trial 5 and 1 shrub in trial 6. In trial 1, sheep receiving both PEG and barley ate more (P=0.002) total shrubs (Quercus ilex, Arbutus unedo and Pistacia lentiscus) than did controls, but no such treatment effect was found for goats. In trial 2, supplemental PEG and barley had a positive effect (P<0.001) on total shrub intake for both sheep and goats when only 2 shrubs (Arbutus unedo and Pistacia lentiscus) were offered. In trial 3, supplemental PEG and barley had a marked positive effect (P<0.001) on intake of Pistacia lentiscus in both sheep and goats. PEG supplemented goats ate more Pistacia lentiscus (39.6 g/kg bw) than did PEG supplemented sheep (28.1 g/kg bw), whereas control sheep and goats ate similar amounts (12.2 and 15.3 g/kg bw, respectively). Supplemental barley and Ach had a positive effect on total shrub intake by both sheep and goats in all 3 trials, in trial 4, when we initially offered 3 shrubs (Juniperus phoenicea, Helichrysum italicum and Juniperus oxicedrus; P=0.002), then 2 shrubs (Juniperus phoenicea and Helichrysum italicum; P<0,001) in trial 5, and finally 1 shrub (Juniperus phoenicea; P=0.02) in trial 6, likewise goats ate more shrubs than did sheep in all 3 trials (P<0.01). According to results, both, PEG and Ach supplement with barley, positively influenced shrub intake when offered 3 > 2 > 1 shrubs to animals and also combinations of more shrubs offered to animals promoted greater intake. Our findings suggest that biological/biochemical diversity plays a very important role in herbivore’s diet selection, enabling animals to better meet their nutritional needs and avoid toxicity.
Ključne riječi
feed additives; polyethylene glycol; activated charcoal; mediterranean shrubs; maquis; secondary metabolites
Hrčak ID:
56774
URI
Datum izdavanja:
15.6.2010.
Posjeta: 1.200 *