The latest nutritional research on feed, pigs, aquatic products, poultry and ruminants in 2018.

January 10-11, 2019, the 100th anniversary of Mr. Yang Feng's birth and the International Academic and Technical Seminar on Animal Disease Resistance Nutrition, organized by the Institute of Animal Nutrition of Sichuan Agricultural University, were held in Wenjiang, Chengdu. Share the conference listening notes organized by DDC Yin Jixun, Wang Yinxing, Liu Feng and Wang Renjie: 2018 Animal Nutrition Research Institute feed, pig nutrition, aquatic animal nutrition, poultry nutrition, ruminant animal nutrition research progress.
The progress of the
-HzW
feed research: Professor Jia Gang of Sichuan Agricultural University
The Effect of HzWrot amine on weaned piglets:
HzW a. Can improve the antioxidant enzyme activity of piglets, improve the ability of free radical removal, and reduce intestinal oxidative damage.
HzW .b. The expression of closely connected proteins in the intestines of piglets is regulated through the MLCK pathway to promote the integrity of the intestinal cell structure.
HzW .c. Regulate the expression of piglets' immune-related signal sabotages, thereby improving the immune and cellular immunity of the intestinal fluid of piglets.
HzW .d. Inhibit the growth of post-intestinal harmful bacteria, promote the proliferation of beneficial bacteria, improve the content of volatile fatty acids in the post-intestinal tract, and maintain intestinal health.
HzW
animal-free raw material weaned pig congener configuration technology research
HzWthrough 2 animal tests (more than 200 pig sizes) to apply the new weaning pig conservation material technology, the preparation of non-animal feed raw materials (fishmeal, whey powder, plasma protein powder) corn type and wheat-type conservation materials, with the following advantages:

HzW .b. Can effectively reduce the cost of formula, increase economic efficiency (formula cost reduction of about 500 yuan).
HzW .c. The formula does not contain animal-derived feed raw materials, feed products have a higher biosecurity.
HzW .Build a new system of water supply for pig farms with "electronic constant temperature and precise flow rate":
HzW a. Drinking water at 30 degrees C can significantly improve ADG and reduce F/G and diarrhea rates.
HzW .b. Drinking water at 30 degrees C can significantly improve the apparent digestion rate of crude protein, coarse fat and energy.
HzW .c. Drinking water temperature and drinking water rate have significant effects on the height of empty intestinal fluff.
HzW .d. Drinking water rate had a significant effect on the height of the reflux.
HzW .e. Drinking water temperature has a significant effect on the empty intestinal velvet ratio.
HzW .Selenium protein X biological function research:
HzW Selx overexpression can alleviate the oxidation damage of liver LO2 cells caused by H2O2, through the P38 pathway as an reactive oxygen scavenger to protect cells from oxidation damage.
HzW .Heat stress damages skeletal muscle cell muscle differentiation, accompanied by an uplifted expression of a large number of selenium protein genes and proteins, indicating that selenium protein may play a protective role in differentiated skeletal muscle cells.
HzW .LPS can induce immune stress in mouse macrophages RAW264.7, which is accompanied by the general reduction of selenium gene expression.
HzW .Increasing the supply of selenium can alleviate the immune stress induced by LPS, and selenium relieves cellular immune stress by regulating the expression of selenium gene, among which GPX1, SELENOH and SELENOW are worthy of attention.
-HzW
large montenegro grass powder instead of feeding meat rabbit study:
HzW study found that the use of large Montenegrin grass powder instead of feeding meat rabbit, the growth performance of the rabbit has no effect, the digestion rate of the nutrients has been improved. Among them, according to the 50% proportion of the replacement of radon, meat rabbit slaughter performance is the highest.
HzW .　　Added coagulation spores on the impact of rabbits:
HzW daily amount of food to add 0.5 x 106cfu/g condensate bacteria reduced the rabbit pre-test (1-14d) F/G up to 11.35% (p 0.05), reduce the rabbit (1-35d) health risk index, reduce diarrhea. The amount of additives suitable for coagulation spores in the meat rabbit's daily grain is 1 x 106 cfu/g.
HzW .　　Effects of zinc added on Peking ducks:
HzW a. Zinc increases the weight of 14 and 35-day-old granules, gains and daily harvests, and reduces the weight ratio.
HzW .　　b. It can improve the integrity of the physical barrier of the empty intestine of the duck, increase the resistance of the empty intestine to the upper skin of the intestine, and the resistance of the empty intestine to the intestinal pathogen.
HzW .　　c. Zinc addition significantly enhances SOD, GPX, GR, CAT and Nrf2 transcription level, improves SOD, GPX, GR, CAT activity, reduces MDA content, and enhances the antioxidant capacity of Peking duck.
HzW .　　Pig nutrition research progress: Sichuan Agricultural University, associate professor of car refining strong
The main reasons for the low rate of breeding rate of
HzW a. Technical problems: low success rate of breeding;
HzW .　　b. Theoretical issues: embryo survival, fetal development; nutritional intake, breast development; ovarian development, oocytes; nutritional procedure.
HzW .　　For backup sows, protein restriction reduces the activation of raw follicles, replenishes methyl donors to improve oocyte quality, and is conducive to the initiation of the condition. For pregnant sows, energy levels in the later stages affect the delivery process and amino acid levels affect weaning weight.
HzW
mother nutrition program affects the growth and health of future generations:
HzW a. Appropriate fiber levels not only improve the performance of sows, but also improve piglet immunity.
HzW .　　b. The effect of adding methyl donor to mother is better than that of children.
HzW .　　Male pig nutrition:
HzW low maternal intake is not conducive to the development of the testicles of future generations of male pigs, blood testicular barrier;
HzW
disease-resistant nutrition research ideas:
HzW to improve disease resistance as the goal of the four major nutrient elements (nutrients, nutrition sources, nutrition levels, functional additives) - pathogenic pathogenic pathogenic factors (viruses, bacteria), feed source pathogenic pathogenic factors (mycotoxins, oxidation products), intestinal health , the immune system to reveal the principle of disease-resistant nutrition, build anti-disease nutrition technology, develop products, promote the application.
HzW .　　Fiber Nutrition:
HzW two weeks after weaning, insoluble fiber is conducive to nutrient digestion and absorption and growth performance, but mixed fiber addition promotes piglet growth and intestinal health effect is better. Different non-starch polysaccharide components had no significant effect on piglet production performance, glucose to promote the intestinal health of piglets the best role.
HzW
the intestinal development law of piglets:
HzW embryo 30d (morphological occurrence) - fetal 90d (accelerated proliferation differentiation later in pregnancy) - newborn period (continued maturation of intestinal closure)
weaning (weaning intestinal damage-repair)
HzW
meat control:
HzW feeding antibiotics or direct chain starch by changing the composition of the gut microbes, affecting muscle metabolism, muscle development, muscle development, muscle development, Pea fiber is not conducive to the growth performance of growing pigs and carcass quality, but the mix of pea and oat bran fiber is very good.
the progress of research on aquatic animal nutrition in
: Professor Feng Lin of Sichuan Agricultural University
the rapid development of freshwater fish such as HzW grassfish
: high incidence of enteritis, rotting and red skin (economic losses), followed by increased use of drugs (increased residues in fish products, serious threattoe the safety of freshwater fish products), and ultimately high-density aquaculture, deterioration of water (decreasing meat quality, affecting the quality of freshwater fish).
HzW .　　The root causes are:
HzW a. internal causes, dysfunctional functional organs, high content of functional organs and muscle PUFA (20-40%), poor oxygen carrying capacity;
HzW .　　b. External causes, high-density aquaculture coercion, poor water body variation coercion. This leads to weak resistance to freshwater fish, damage to organs and tissues, destruction of organ immune barriers, and eventually a high incidence of freshwater fish and a decrease in meat quality.
HzW .　　Through the study, it was found that:
HzW appropriate levels of cholesterol, magnesium, selenium, and lipoic acid can enhance the structural integrity and immune function of grassfish intestines, head and kidneys, spleen, skin and gills, improve the ability of grass fish to resist disease (enteritis, red skin and rotting) and promote grass fish growth.
HzW .　　The appropriate level of cholesterol, magnesium, selenium and lipoic acid can improve the muscle physical and chemical properties of grass fish, the composition of flavor amino acids, health fatty acids and essential amino acidcontent, thereby improving the quality of fish meat.
HzW .　　Add suitable levels of functional substances to the feed: glycosase, glycolic sugar, nucleotides, soybean isoflavones and soon can enhance the immune function and structural integrity of herb's functional organs, improve the ability of grass fish to resist disease (enteritis, red skin and rotting) to maintain intestinal, body and slug health;
HzW .　　The safety limit of hazard factors such as aflatoxin and vomit toxin in fish feed determined by the incidence of disease was lower than the safety limit of 37.1%-40.97% determined by production performance.
The progress of poultry nutrition research in
Sichuan Agricultural University, Associate Professor Ding Xuemei
HzW the effect of vitamin D3 in different calcium levels of feed on egg-laying chickens in the latter stages of egg production:
HzW VD3 deficiency, shell eggs, soft shell eggs increased, yield decreased, egg production rate decreased; 4% calcium levelsignificantly increased eggshell weight, eggshell calcium content and egg chicken tibia strength;
HzW .　　High calcium increased the uterine calcium binding protein, reduced the activity of calcium ATP enzyme and carbonation enzyme, and the addition of VD3 in the late egg production had no obvious effect on egg chicken.
the effects of adding VE to the aged corn feed
The Effects of Vev on Egg Chickens:
HzW aged corn significantly reduced the apparent digestion utilization of egg quality and crude fat, and significantly reduced the content of LDL-C in serum TC, LDL-C, VLDL-C and liver, affecting fatty acid composition in egg yolks.
HzW .　　The addition of VE in aged corn was not obvious to the performance of egg and chicken production and the adverse effects of fat metabolism. But high doses of VE have a certain mitigating effect.
The effect of
heavy metal molybdenum on egg white quality: wheat has the highest content of radon in
HzW energy feed, and high levels of DDGS, rapeseed, and corn germ in protein feed.
HzW .　　Palladium caused the egg-laying tubes to swell most of the antioxidant enzymeGH-PX vitality and T-AOC significantly reduced, the content of the oxidation product MDA significantly increased.
HzW .　　Tea polyphenols can reduce most of the residue of molybdenum and fallopian tube puff, relieve oxidative stress and apoptosis caused by radon, change the composition of egg white protein, and improve the negative effects of molybdenum on egg white quality.
HzW .　　Effects of limited feeding:
HzW to change the physiological state of the egg and chicken body, accelerate fat metabolism, reduce the probability of follicle closure, slow down the development of primary follicles in the ovaries to mature follicles.
HzW .　　The net income of free feeding was slightly higher than the 15% limit feeding group, but in terms of feed income, the 15-age group was significantly higher than the free-harvesting group.