The poultry immune system has priority for the use of energy and nutrients. Expensive energy is first used for the development, maintenance, and mobilization of the immune system. Normally, about 2% to 4% of the metabolic energy is used in the immune system. maintain.
Improve broiler weight gain and feed ratio, reduce mortality
The poultry immune system has priority for the use of energy and nutrients. Expensive energy is first used for the development, maintenance, and mobilization of the immune system. Normally, about 2% to 4% of the metabolic energy is used in the immune system. maintain. If the innate immune system is used passively because of non-infectious factors, it will consume more energy, which is far more expensive than the use of specific acquired immunity, and long-term chronic immune stress will cause damage to tissues and organs.
Feed-induced immune responses pose a potential threat to poultry production and body weight uniformity, especially to small animals and animals in conditions of malnutrition, heat stress and disease. In a poor production environment, especially in the presence of challenges in intestinal integrity, galactomannan as a pseudo-pathogen, its induced innate immune response may aggravate the immune stress of weak animals.
A large number of studies have shown that the addition of β-mannanase to feed can improve the performance of broilers and laying hens. The data in Tables 2 and 3 show that supplementation of β-mannanase can improve the weight gain and feed-to-meat ratio of broilers, reduce the energy concentration of the diet, and enable the performance of broilers to reach the level of the high-energy diet group. In addition, this practice can reduce the uniformity of broiler weight and reduce the mortality of broilers.
The results of Table 2 show that the addition of 225 ppm (42 kcal/kg) and 400 ppm (77 kcal/kg) of beta-mannanase significantly increased the daily gain of broilers at 43 days of age (respectively 4.6%, 8.7%), improving the coefficient of variation of the population by 1.4 to 2.7 points, the uniformity of the flock is improved, and eventually the proceeds will be seen in the slaughter. According to data from a recent study by Cho, such as Honolulu University in Korea, the strategy of reducing energy, adding β-mannanase, can increase the breast meat yield of broilers by 8.3%.
The use of β-mannan can also expand the use of feed ingredients, ease the restrictions on the price of soybean meal, and make full use of local cheap feed ingredients to reduce costs. Recently, researchers such as Mohammad Akbari Gharaei of the Animal Science Department of the University of Agricultural Sciences and Natural Resources (GUASNR) in Iran conducted four different feeds for guar, chickpea, whole jujube and palm pupa. The test showed that the addition of β-mannanase can increase the dosage of guar in broiler feed to 8%, the addition of chickpea by more than 10%, and the use of whole jujube to 35%. Palmetto increased to 40%. More importantly, the four different ratios of feed supplemented with β-mannanase can still achieve satisfactory production results for broiler farms.
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