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In situ effective ruminal dry matter and neutral detergent fiber disappearance of canola meal from twelve Canadian crushing plants over four production years.

E. M. Paula

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06-23-2020

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Abstract:

T136
In situ effective ruminal dry matter and neutral detergent fiber disappearance of canola meal from twelve Canadian crushing plants over four production years.
E. M. Paula*1, J. L. P. Daniel2, L. G. Silva3, G. M. Wachekowski1, H. H. A. Costa4, A. P. Faciola5. 1Instituto de Zootecnia, Centro APTA Bovinos de Corte Sertaozinho, SP, Brazil, 2Universidade Estadual de Maringa Maring�, PR, Brazil, 3Department of Animal Science, College of Agrarian and Vet Sciences Jaboticabal, SP, Brazil, 4Universidade Estadual Vale do Acarau Sobral, CE, Brazil, 5University of Florida, Animal Sciences Department Gainesville, FL.

Canola meal (CM) has been widely used as protein source for dairy cows; however, CM contains about 30% NDF (% of DM), which is greater than other vegetable plants used as protein sources, such as soybean meal. According to current prediction models CM NDF ruminal digestibility can be as low as 35%, which may not accurately estimate CM energy value. Therefore, the objective of this study was to assess in situ effective ruminal DM and NDF disappearance of CM produced in Canada over a 4-year period. Samples were collected from 12 Canadian processing plants over 4-years (2011—2014, n = 48). Ruminal in situ incubations were performed at 0, 24, 48, 96 and 288h to determine NDF fractions A, B, and C and the effective ruminal DM and NDF disappearance (ERD). Approximately 1.25 g of sample was weighted, in triplicate, into Dracon bags (R510, 5 � 10 cm, 50 �m porosity, ANKOM Technology), consisting of an area ratio: surface of 20 mg/cm2/sample. Bags were incubated in reversal chronological order in the ventral rumen of 3 cannulated steers. Statistical analyses were performed using PROC Glimmix of SAS. The model included processing plant and year of harvesting as fixed effects. Processing plant did not affect dry matter ERD (P = 0.37) and averaged 87.5% of DM. However, CM harvested in 2011 and 2013 had greater values than 2012 and 2014 (90.1 vs. 84.95 of DM, on average). Processing plant affected (P < 0.01) NDF fraction A and B, where for fraction A the lowest value was 12.2 and the highest 33.4% of NDF, and for fraction B the lowest value was 45.8 and the highest 70.2% of NDF. Fraction C and neutral-detergent fiber ERD (NDFERD) was not affected by processing plant and averaged 19.9 and 76.8% of NDF, respectively. Similarly, with dry matter ERD, NDFERD was affected (P < 0.01) by year of harvesting, where 2011 and 2013 had greater values than 2012 and 2014 (80.4 vs. 73.2% of NDF, on average). Overall, our results indicate that NDF ruminal digestibility of CM can be as high as 82.4% and, therefore, the current prediction models may underestimate CM energy value.

Keywords: energy, fiber digestibility, indigestible NDF.