Improvement of Blood Meal as an Ingredient in Hybrid Catfish (Clarias macrocephalus × Clarias garepinus) Diet
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Abstract
The purpose of this research was to study nutritional value and digestibility efficiency of quality-improved blood meal using different enzymes, and to develop feed for hybrid catfish using different levels of cow's blood meal. The study comprised hybrid catfish diet containing 0, 2.5, 5 and 7.5% blood meal. The hybrid catfish were fed with all 4 diets, with catfish feeding at 5% of body weight per day, divided into 3 meals. Weighing was conducted to adjust feed intake, and growth data were collected every 2 weeks over 8-week period. It was found that the improved blood meal had better nutritional value and digestibility compared to non-enzymatically fermented blood. Additionally, the hybrid catfish fed with blood meal at all levels had the final weight, weight gain, daily weight gain, feed intake, feed conversion ratio and survival rate equivalent to the control group (P > 0.05). As for the cost of feed production, it was found that the diets containing blood meal had lower costs compared to the control group, at 31.20 ± 1.60, 27.08 ± 0.99, 28.01 ± 3.84 and 25.40 ± 0.83 baht per 1 kg of fish weight, respectively. The hybrid catfish diet containing 7.5% blood meal could reduce feed production costs by 18.59%. Therefore, the inclusion of blood meal in hybrid catfish diet had an effect on growth and survival rate compared to the control group and could reduce the cost of aquatic animal feed production.
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