The test measures the effects of shed (B) elements in the diet on pig growth performance, bone chemical composition and Ca and P metabolism. 36 21-day-old weaned castrated pigs were randomly divided into 3 treatments. The diets for each treatment were: (1) boron-free diet (control); (2) basal diet + B (5 mg/kg day) ()) basal diet + B (15 mg/kg diet). Boron is added in the form of boric acid. The trial period is divided into the nursery period (35 days) and the growth period (30 days). At the end of each phase, blood samples are taken from each castrated pig. After the 30-day growth period, 8 pigs from each treatment group were transferred to a stainless steel metabolic box for rearing. After 7 days of conditioning, 7d of total feces was taken. During the adjustment period and during the collection of excreta, the feed intake of the pigs should be 90% of the free feed intake of the pigs in the control group. After the end of the 7-day collection period, the pigs were slaughtered and the femur and tibia were collected to assess the chemistry of the bones. Component. During the nursery period, the average daily gain (ADG) and average daily feed intake (ADFI) increased significantly (P<0.05) due to the addition of B, but the feed conversion rate did not change significantly (P=0.34). In the growth phase, ADG and ADFI increased significantly due to the addition of B (P<0.05), but the feed conversion rate did not change (P=0.97), the percentage of ashes did not change significantly (P=0.44), but the proportion of P in the ashes was obvious. For the ascending (P<0.05), the tissue shear force of the pigs fed B (15 mg/kg diet) was higher than that of the feed B (5 mg/kg diet) (P<0.05). The addition of B did not change the apparent absorption rate and utilization rate of Ca and P (P>0.05).
These data demonstrate that the addition of B to pig diets accelerates growth and increases bone strength, but does not significantly affect Ca and P metabolism.
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