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Enzyme mix makes camelina more nutritious

A new study with broiler chickens shows that supplementation with a multi-carbohydrase enzyme formulation can substantially boost the nutritional power of camelina meal, a unique feed source on the rise in Canada and the US.

"Camelina is the new kid on the block as a feed option for poultry," says Rob Patterson of Canadian Bio-Systems Inc. (CBS Inc.), who conducted the study along with Dr Tofuko Woyengo and Dr Ruurd Zijlstra of the University of Alberta. "Our study confirms it has a lot to offer from a nutritional standpoint and that using the right formulation of multi-carbohydrase is an effective way to capture more of that full nutritional value."

Multi-carbohydrase enzyme technology

While it's one thing to have strong nutritional value, it's another to make sure as much of that  value as possible is available for absorption and use by the animals, explains Patterson, CBS Inc. Technical Director. Multi-carbohydrase enzyme technology, with its multiple enzyme sources and activities, acts as a universal key that frees nutrients from a number of otherwise hard-to-digest feed components. "This supports the maximum nutrient extraction possible for energy and growth."

Camelina, also known as 'false flax' or 'wild flax,' is an oilseed crop that initially experienced significant demand before the recent era of dominance of rapeseed and canola. The unique crop, recognised as an excellent source of Omega-3, is now enjoying a fresh resurgence due to its advantages as an option for healthy oils, biofuels, high-end bio-lubricants and bio-plastics, and even jet fuel. It grows well on the Canadian prairies and in key US growing regions, where it is well adapted and has resistance to many common pathogens and pests.

High concentration of Omega-3 oils

"The rise in camelina production is now becoming a good news story for livestock and poultry industries, because the residual meal left over after oil extraction has shown an attractive nutritional profile for animal feed," says Patterson. "As an added advantage, the high concentration of Omega-3 oils in the meal has been shown to produce Omega meat in broiler chickens – making it a great source not only of high quality feed but as a means of adding value to poultry products."

The study focused on variations of a diet using corn and cold-pressed camelina cake (CPCC). Diets that included multi-carbohydrase supplementation showed a substantial increase in the standardized ileal digestibility (SID) of three different major amino acids – methionine, threonine and tryptophan – along with a strong overall boost to the apparent metabolizable energy, N-corrected (AMEn) value of the diet, which increased by 5.6%.

The AMEn value shows the difference between the gross energy in the feed and the gross energy in the faeces, urine and gasses, to reflect how much energy is actually captured by the animal instead of passed through undigested.

Strong gains are possible

"The results show multi-carbohydrase is effective with camelina meal and strong gains are possible," says Patterson. "Indications are the level of advantage can be further increased depending on the level of multi-carbohydrase used and the overall diet composition. Each poultry operation can determine the ratios that work best economically and effectively for them, depending on their own specific objectives and feeding approaches."

Earlier this year Canadian approval was granted for feeding cold-pressed non-solvent extracted camelina meal to broiler chickens at up to 12% inclusion, and approval for inclusion in layer feed is also being considered.

Similarly, the US-FDA has expressed "no objection" to feeding camelina meal to broiler chickens and laying hens up to 10% of their final diet.

Trial details

The CBS Inc. and University of Alberta study involved 600 male broiler chicks divided into 40 groups and fed five diets in a completely randomised design with eight groups per diet, from 15 to 21 days of age. Differences were observed among variations of a corn-based basal diet, the same basal diet with 30 percent replaced by CPCC, and both of these diets without or with multi-carbohydrase enzymes supplementation, as well as an N-free diet.

The corn-based basal diet was fed to determine nutrient digestibility and retention for CPCC by substitution. The N-free diet was fed to estimate basal endogenous amino acid losses, for determining the SID of amino acids. On a dry matter basis, CPCC contained 39.8% crude protein, 1.89% lysine, 0.70% methionine, 1.56% threonine, 0.45% tryptophan, 12.7% ether extract, and 38.3% neutral detergent fibre. In addition to boosting the availability and absorption of methionine, threonine and tryptophan, multi-carbohydrase increased the AMEn value of CPCC from 1,533 to 2,072 kcal/kg of dry matter.

The specific multi-carbohydrase formulation used in the study was Omegazyme from CBS Inc.

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