TY  - JOUR
T1  - Crop Production, Plant Fractions and <I>In situ</I> Degradability of Silages from Different Sorghum Hybrids
AU - , S. Arias AU - , O.N. Di Marco AU - , M.S. Aello AU - , A.J. Freddi AU - , A.M. Piazza 
JO  - Journal of Animal and Veterinary Advances
VL  - 7
IS  - 11
SP  - 1387
EP  - 1393
PY  - 2008
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2008.1387.1393
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2008.1387.1393
KW  - Sorghum silage
KW  -hybrids
KW  -in situ degradability
AB  - The objective of this study, was to evaluate 3 different sorghum hybrids for whole plant silage on crop production, morphological composition and silages <I>in situ </I>degradability. Two Double Purpose (DP) hybrids (AG 200 and Nutritop) and one for grain production (G, Vdh 303) were sown in Azul, Argentina. Yield, plant fractions and chemical composition of plant fractions and silages were determined. Silage samples were incubated <I>in situ</I> for 0, 4, 15, 24 and 48 h and the effective dry matter degradation (ED) was calculated assuming a fractional passage rate of 2, 4 and 8%/h. Data were adjusted to the exponential equation of: p = a + b (1-e<SUP>–ct</SUP>) and analyzed as a complete randomized block design considering field plots as experimental unit. The G hybrid yielded more (55%) than the other two DP hybrids, although the head content in the plant was not different between hybrids, being in average 42%. Heads presented higher CP and lower FDN content than leaf and stalks and   also   presented   higher <I>  in   vitro </I>  organic   matter   degradability (OMD, 729 g kg<SUP>-1</SUP> DM) than leaves (605 g kg<SUP>-1</SUP> DM). Silage <I>in vitro</I> OMD (average 558 g kg<SUP>-1</SUP> DM) and chemical composition did not differ among hybrids. Soluble  fraction  (a)  was  higher  in the DP silages, but degradable fraction (b) was higher in the G sorghum Vdh 302 than in AG 200 but not differed from the Nutritop. Potential degradability (a + b) was no different among  hybrids  (72%  in  average), neither rate of DM degradability. Silage EDs were not different at a kp of 2% h <SUP>1</SUP> (54.5% in average), but differed at higher rumen outflow rates.
ER  -