Organic zinc is a trace element necessary for the synthesis of steroid hormones such as sex hormones. Therefore, zinc plays a unique and important role in reproduction. Zinc A lack or excess of it will adversely affect the reproductive performance of the animal. Zinc deficiency will affect the entire reproductive process of sows. Long-term intake of feeds with insufficient zinc in sows can cause ovarian dysplasia, atrophy, miscarriage and even dystocia, and early embryonic death. Zou Xiaoting et al. reported that appropriately increasing the dietary zinc content of pregnant sows in the diet can increase the serum albumin level of newborn piglets and the serum progesterone content of sows, and reduce the serum urea nitrogen content. Adding an appropriate amount of zinc to the feed of pregnant sows shortens the interval from weaning to estrus, significantly improves the farrowing ability of sows (P<0.05), increases the re-estrus rate and conception rate after weaning, and advances the first estrus time of gilts; Body weight increased significantly during the estrus period, and litter performance improved significantly (P<0.05).
At present, in the feed industry, the most commonly used inorganic zinc is zinc sulfate. Zinc sulfate exists in ionic form in the body and easily reacts with other nutrients in the feed to form insoluble complexes, causing reduced enzyme activity, imbalance of hormone secretion in the endocrine system and changes in the tissue structure of the reproductive organs, thereby reducing the animal’s absorption of zinc. Utilization rate, and zinc sulfate for feed is mainly an industrial by-product. As a feed additive, it may cause unknown toxic adverse reactions to the body. Organic zinc has the characteristics of high absorption and utilization, good stability and extremely low toxicity. Numerous studies have shown that adding an appropriate amount of organic zinc to the diet can effectively improve the reproductive performance and immunity of sows, thereby improving the limb health of sows. .
Studies have reported that adding an additional 200mg/kg zinc glycinate to sows’ basal diet can significantly improve the reproductive performance of sows (P<0.05). Compared with the control group, the feed intake of sows supplemented with zinc glycinate increased by 7.71% on average, the estrus interval was shortened by 10.12%, the body weight loss during lactation was reduced by 6.93%, and the number of litters increased by 0.53%. Adding zinc glycinate to sow diet also has a tendency to increase the weaning number, birth weight and average daily gain weight of suckling piglets. However, in the experiment, except for the significant difference in weaning weight, which increased by 7.14% (P0.05). In addition, the zinc content in the blood of suckling piglets also increased significantly. This shows that adding zinc glycinate to sow diets can significantly increase the effective mass concentration of zinc in piglets (P<0.05), thereby alleviating stress and improving the production performance of suckling piglets.
Hoover’s experiments show that adding a certain amount of zinc methionine to the sow diet can increase the conception rate of primiparous sows for the first time by an average of 7.2%. The average number of piglets born alive increased by 0.37, the first-time stillbirth rate decreased by 2.1% on average, the survival rate of weaned piglets increased by 2.9% on average, and the stillbirth rate of multiparous sows in the second to eighth parities decreased by 7.1% to 29.6010, and the stillbirth rate of weaned piglets increased by 2.9% on average. The survival rate increased by 3.1% to 6.2%.
Peters et al. found that the number of litters and the number of piglets born alive in sows fed organic zinc was extremely significantly higher than that in the inorganic group (P<0.01). The daily growth quality of suckling piglets also showed a significant improvement trend. Payne et al.'s study also confirmed that the mixture of organic zinc and inorganic zinc (100 mg/kg zinc sulfate + 100 mg/kg amino acid zinc) in sow diets can improve the birth quality and weaning litter quality of piglets. Wu Ning's research shows that adding organic zinc to sow diets can also improve the weaning survival rate of piglets and improve the birth and weaning quality of piglets. Sows supplemented with organic zinc showed a trend of reduced lactation loss, shortened estrus interval and higher feed intake, confirming the impact of organic zinc on sow reproductive performance.
Adding 80mg/kg zinc lysine to the diet of weaned piglets can improve the activity of alkaline phosphatase and the zinc quality in serum concentration, the daily growth quality of piglets also increased by 13.7%. Ward conducted three experiments with nearly a thousand piglets and confirmed that adding 250 mg/kg zinc methionine can increase the feed intake, growth rate and feed conversion rate of weaned piglets by 3% to 4%, 5% to 8% and 1% respectively. 11%, the body weight at the end of the nursery period increases by 0.63~0.90kg, and its growth-promoting effect is equivalent to 2000mg/kg zinc oxide. Fang Jun et al. reported that adding 80 mg/kg zinc methionine significantly increased the average daily weight gain of piglets. Among them, the daily mass gain in the early period from 0 to 14 days was 16.03% higher than that of the control group (500 mg/kg zinc oxide) (P<0.05), in the later period from 14 to 21 days it was 4.32% higher, and in the whole period it was 12.7% higher (P<0.05). Hu Xiangdong In the practical diet for weaning piglets containing 100 mg/kg zinc, zinc amino acid complexes were used to replace 60% of the zinc sulfate addition. Compared with the 100% zinc sulfate group, the daily gain quality increased by 22.9% throughout the period, and the average daily feed intake Volume increased by 25.3% in the previous period.
The above experimental data show that using organic zinc to partially or completely replace inorganic zinc in the diet of lactating sows can significantly improve the newborn quality and weaning survival rate of piglets. and piglet weaning quality (P<0.05), and can reduce the pollution caused by high zinc to the environment. It is a safe and efficient nutritional additive. However, judging from the current application situation, there are many problems that need to be further solved, such asStudy and determine the absorption mechanism of organic zinc, especially the location in specific tissues and the molecular level metabolism mechanism in target tissue cells; determine standards that can accurately reflect the biological potency of organic zinc relative to inorganic zinc; simultaneously study different Optimal addition amount for sows at different stages.
Shanghai New Materials Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and sales of organometallic catalysts. Its main products arePolyurethane catalyst, organic zinc, organobismuth, organic zirconium, organic rare earth, etc.
