Authors: AYDAN YILMAZ, ÜLKÜ GÜRSOY
Abstract: The purpose of this study was to evaluate the effects of various supplements on the in situ dry matter degradability (DMD) characteristics of maize silages. The proportion of the supplements was 1% urea, 2% molasses and 5% cracked barley. In all silages 2% salt was used as the protector. Moreover, one of the silage groups was prepared without salt to examine its impact on DMD. The ingredients of the silages prepared in this study were 1) maize silage (S1), 2) maize silage + salt (S2), 3) maize silage + cracked barley + salt (S3), 4) maize silage + urea + cracked barley + salt (S4), 5) maize silage + urea + cracked barley + molasses + salt (S5), 6) maize silage + urea + salt (S6), 7) maize silage + molasses + salt (S7), 8) maize silage + molasses + cracked barley + salt (S8) and 9) maize silage + urea + molasses + salt (S9). The samples of the silages were incubated for 4, 8, 16, 24, 48, 72 and 96 h in rumen. In order to do this, 3 mature Akkaraman rams, of 70 kg live body weight, with ruminal cannulas were used in this experiment. The results of ANOVA indicated that the interaction between silages and incubation periods was not statistically significant (P > 0.05). However, there was evidence of a statistically significant difference in DMD between at least 2 silages, and incubation periods (P < 0.01). Regarding the degradability characteristics of a, a + b, Pe (2%), Pe (5%) and Pe (8%), there was also a statistically significant difference between at least 2 silages (P < 0.01). From the findings, an important conclusion is that the addition of various supplements to silage should positively influence DMD. The use of salt as a protector did not, however, have any significant effect on DMD. Furthermore, the results showed that molasses supplementation did not have any positive impact, as the other supplements had.
Keywords: Degradability, in situ, dry matter, maize silage, urea, molasses, barley
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