Zijlstra, R. T., Swift, M. L., Wang, L. F., Scott, T. A. and Edney, M. J. 2011. Short Communication:Near infrared reflectance spectroscopy accurately predicts the digestible energy content of barley for pigs. Can. J. Anim. Sci. 91: 301–304. Density, chicken apparent metabolizable energy (AME), and near infrared reflectance spectroscopy (NIRS) were tested to predict the widely varying swine digestible energy (DE) content of barley. The DE content of 39 barley samples ranged from 2686 to 3163 kcal kg−1 (90% DM) in grower pigs. The R2 between DE content and density (0.14) and broiler chicken AME content (0.18 and 0.56, without and with enzyme, respectively) was low. In contrast, the coefficient of determination to predict swine DE content for ground barley samples using NIRS was respectable for external validation (R2=0.74) and internal cross validation (1-VR=0.79), but more robust calibrations should be developed for commercial application.
Oba, M. and Swift, M. L. 2014. SHORT COMMUNICATION: Effects of feeding Falcon or Tyto whole plant barley silage on milk production and feed efficiency. Can. J. Anim. Sci. 94: 151Á153. Eight lactating dairy cows were fed diets containing either Falcon or Tyto whole-plant barley silage (Hordeum vulgare; WPBS) in a crossover design to study effects on milk production and feed efficiency. The in vitro fibre digestibility (IVFD) of Falcon and Tyto WPBS was 61.6 and 57.2%, respectively. Cows consuming the Falcon WPBS utilized feed more efficiently compared with those consuming the Tyto WPBS (1.44 vs. 1.32 kg milk kg(1 dry matter intake) although milk yield was not affected. This research demonstrates that IVFD may be an important quality indicator of WPBS when balancing diets for high producing lactating cows.
response to processing, in vitro gas production and fermentation of western Canadian feed barley. Can. J. Anim. Sci. 94: 725Á729. Sixty feed barley samples were collected from various locations in western Canada. Samples were either ground (1 mm) or dryrolled to a processing index of 80%, and fermentability was assessed by measuring gas production (GP) and dry matter disappearances (DMD) at 0, 4, 8, 14 and 24 h of incubation using a batch culture technique. Physical and chemical composition, and GP and DMD varied substantially among samples. There were significant correlations among test weight and nutrient content of barley with GP and DMD of ground barley. The results indicate that the impact of nutrient content on in vitro DMD is more easily detected with ground than rolled barley.
COMMUNICATION: The effect of seed hardness and malting characteristics on in situ dry matter digestibility of barley grain in beef heifers. Can. J. Anim. Sci. 95: 299Á303. An in situ study was conducted to evaluate the relationship between ruminal dry matter digestibility (DMD) and seed hardness or malting characteristics of barley grain. Samples were selected for low and high values of seed hardness index (53 vs. 65; N 018), beta-glucan content in wort (122 vs. 316 ppm; N018), diastatic power (146 vs. 2038L; N 018), and friability (46 vs. 81%; N 018) in malt, and incubated in the rumen of three beef heifers for 4, 12 and 48 h. In situ DMD did not vary with beta-glucan concentration or friability. However, barley grain with low seed hardness had lower (P 00.02) in situ DMD than those with high seed hardness after 4 h of incubation. The barley samples with low diastatic power also had (P 00.02) higher DMD than with high diastatic power after 4 h, a trend (P00.07) that continued after 12 h of incubation. Seed hardness and malting characteristics may have the potential to predict DMD of barley grain in the rumen. However, observed differences in in situ DMD were relatively minor, and we did not detect a relationship between malting characteristics and in situ DMD at longer incubation times. This suggests that the identified grain physical and malt parameters may impact the rate, but not the extent of barley grain digestion in the rumen. COMMUNICATION BRE`VE: Les effets de la durete´du grain et les qualite´s maltie`res sur la digestibilite´in situ des matie`res se`ches du grain d'orge chez les ge´nisses de boucherie. Can. J. Anim. Sci. 95: 299Á303. Une e´tude in situ a e´te´effectue´e pour e´valuer la relation entre la digestibilite´dans le rumen des matie`res se`ches (DMD Á « dry matter digestibility ») et la durete´du grain ou les qualite´s maltie`res du grain d'orge. Les e´chantillons ont e´te´choisis pour des valeurs faibles ou fortes d'indice de durete´du grain (53 c. 65; N 018), de teneur en be´ta-glucane dans le mouˆt (122 c. 316 ppm; N 018), du pouvoir diastatique (146 c. 2038L; N 018), et de la friabilite´(46 c. 81%; N018) dans le malt, puis incube´s dans le rumen de trois ge´nisses de boucherie pendant 4, 12 et 48 h. La DMD in situ n'a pas varie´selon la concentration en be´ta-glucane ni la friabilite´. Par contre, les grains d'orge ayant de plus faibles durete´s avaient une plus faible (P00,02) DMD in situ que ceux de plus forte dureted u grain apre`s 4 h d'incubation. Les e´chantillons d'orge avec faible pouvoir diastatique avaient aussi une plus forte DMD (P 00,02) que ceux avec fort pouvoir diastatique apre`s 4 h, une tendance (P00,07) qui se poursuivait apre`s 12 h d'incubation. La durete´du grain et les qualite´s maltie`res ont le potentiel de pre´dire la DMD du grain d'orge dans le rumen. Par contre, les diffe´rences observe´es de DMD in situ e´taient relativement mineures et nous n'avons pas de´cele´de relation entre les qualite´s maltie`res et la DMD in situ lors de plus longues pe´riodes d'incuba...
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