7results about How to "Improve fertilization rate" patented technology

The application provides an artificial breeding method of Onychostoma wujiangense, and belongs to the technical field of aquatic animal breeding. The artificial breeding method of Onychostoma wujiangense comprises the steps of parent fish classification, parent fish cultivation, artificial parturition induction, natural insemination, artificial insemination, fertilized egg hatching, larva cultivation and juvenile fish cultivation. The parturition induction agent is reasonably matched, the parturition induction injection time is accurate, the parturition induction rate, the fertilization rate and the hatching rate are improved, and the parent fish damage is small. The application also clearly defines the feeding methods at different stages of seed cultivation, improves the survival rate of Onychostoma wujiangense seed cultivation stage, and lays a technical support for the artificial breeding of the endangered species Onychostoma wujiangense.

The invention relates to a grouper crossbreeding method. The method comprises the four steps of parent breeding, temperature-sensitive domestication, artificial spawning and insemination, incubation and fry breeding, specifically, cold water-based clear water stone spots and hot water-based brown spot stone spots are selected as parents, the clear water stone spots are used as female parents, the brown spot stone spots are used as male parents, and the middle water temperature is adapted through gradient temperature-sensitive domestication; stress-resistant feed containing hilsa herring egg source peptide and haematococcus pluvialis astaxanthin ester and a temperature-sensitive blender are matched, a reproductive care agent is supplemented to strengthen sperm and egg performance, and normative spawning induction, insemination and graded cultivation processes are adopted. According to the method, the problems of poor water temperature adaptation and low hatching rate of grouper hybrid sperms and eggs in different temperature areas are solved, the wide-temperature property of filial generations is improved, the method adapts to the water temperature of 18-28 DEG C, the hatching rate, the fry survival rate, the adult fish survival rate and the average weight of single fish are remarkably improved, and technical support is provided for industrial application.

A method for promoting ovarian development of pelteobagrus vachelli belongs to the technical field of fish culture, and is characterized in that in the pelteobagrus vachelli culture process, a functional additive is fed at the ovarian development preparation stage and the ovarian development strengthening stage, and the functional additive is prepared by mixing epigallocatechin gallate and compound unsaturated fatty acid, adding the compound unsaturated fatty acid into the mixture, and stirring to obtain the functional additive for promoting the ovarian development of the pelteobagrus vachelli. Beta-cyclodextrin is firstly adopted for inner layer embedding, then chitosan is adopted for outer layer coating, the microcapsule is prepared, and the composite unsaturated fatty acid is composed of monounsaturated fatty acid and polyunsaturated fatty acid according to the volume ratio of (0.8-1): (1-1.2). EGCG and compound unsaturated fatty acid are compounded and embedded to prepare microcapsules, the microcapsules are added into feed for feeding, ovarian development of pelteobagrus vachelli is effectively promoted, the number of oocytes of pelteobagrus vachelli is increased, meanwhile, the cell proportion of III-stage oocytes is increased, the reproductive capacity of pelteobagrus vachelli is effectively improved, the survival rate of pelteobagrus vachelli is increased, and the survival rate of pelteobagrus vachelli is increased. The egg laying amount, the fertilization rate and the hatching rate are improved.

The application provides alligator feed, an alligator feeding method and application, and relates to the technical field of alligator breeding. The alligator feed with high meat yield rate comprises fish, fish meal, vitamins, calcium powder, medicinal materials and probiotics; the fish meal comprises fish, shrimps and land animal meat; and the medicinal materials comprise at least one of malt, houttuynia cordata and hawthorn. Through the alligator feeding method, the alligator feed is fed, the meat yield rate, the egg production rate of alligators, and the fertilization rate and the hatching rate of alligator eggs are improved, the alligator feeding system has high economic benefits, and the preparation method of the alligator feed is simple and efficient.

The invention discloses an artificial propagation-hybridization combined breeding method for meat goats, and relates to the technical field of animal breeding, and the method comprises the following specific steps: selecting a goat variety with good meat performance as a female parent, and selecting a goat variety with large physique as a male parent; the method comprises the following steps: performing in-vitro culture on female parent oocytes to obtain mature oocytes containing first polar bodies, screening high-activity sperms by adopting a temperature gradient screening device, performing in-vitro fertilization on the mature oocytes and the high-activity sperms, culturing the mature oocytes and the high-activity sperms to a hybrid blastocyst form, transplanting the mature oocytes and the high-activity sperms into a female body, and developing the mature oocytes and the high-activity sperms until the mature oocytes and the high-activity sperms are naturally delivered to obtain a hybrid F1 generation; backcrossing the F1 generation with the female parent, backcrossing the backcrossed offspring with the female parent for multiple times until a breeding target is met, and carrying out cross-crossing fixation to obtain a new variety / line with excellent characters; the sperm screening efficiency is improved by utilizing the screening device, and the quality of the screened sperms is ensured, so that the fertilization efficiency and the embryo survival rate are remarkably improved.

The invention provides a method for promoting ovarian development and healthy breeding of Chinese softshell turtles in a hibernation period, and relates to the technical field of Chinese softshell turtle breeding, the method comprises the following steps: S1, fishing female sexually mature Chinese softshell turtles after the Chinese softshell turtles enter the hibernation period, and cleaning the surfaces of the Chinese softshell turtles; s2, the healthy Chinese softshell turtles are subjected to single wrapping feeding in a low-temperature water environment, and then the Chinese softshell turtles are induced to enter a hibernation state under the low-temperature condition; s3, after the pond of the Chinese softshell turtles is cleaned, water in the pond is drained, and bottom mud is disinfected and improved in the hibernation season; s4, performing creatine intraperitoneal injection on the Chinese softshell turtles; s5, performing water storage and fertilizer and water management on the disinfected pond; s6, putting the Chinese softshell turtles subjected to creatine treatment in proportion when the air temperature is appropriate; compared with the prior art, the method has the following advantages that 1, ovarian development of the Chinese softshell turtles in the hibernation period is stimulated through a non-hormone method, and food safety is guaranteed; hibernation is carried out without the bottom mud environment of the culture pond, and the hibernation environment of the Chinese softshell turtles is improved; 3, single feeding and intensive management are realized, so that the survival rate of hibernation is increased; 4, when the sleeping environment is met in the second year and the temperature change is mild, pond entering treatment is carried out, the female-male proportion is reasonably matched, and disease outbreak caused by dead individuals is avoided; 5, while the parents are independently bred in an intensive manner, the bottom mud of the outer pond can be disinfected, exposed to the sun and the like, and an excellent environment is created for cultivation in the second year; and 6, through creatine injection, early development of the ovary of the Chinese softshell turtle can be effectively stimulated under the condition that the natural process of hibernation is not influenced, so that the sexual maturity period can be shortened, and the breeding efficiency can be improved.

The present invention provides a method and application for optimizing the fertility control of female fish. The method uses gene editing technology to knock out the key coding gene for the synthesis of gonadal progesterone in fish, block the synthesis of fish progesterone, and hinder the maturation and ovulation of the oocytes of the obtained homozygous female fish, so that it is unable to mate and lay eggs with wild-type male fish, thereby obtaining infertile female fish. After the obtained infertile female fish is treated with gonadotropin and corresponding preparations, it can restore the ability to mate and lay eggs naturally with wild-type male fish, and achieve a higher fertilization rate and membrane emergence rate, and the surviving offspring individuals have no obvious difference in morphology from wild-type fish of the same period. In the above manner, the method provided by the present invention can be widely used in various types of aquaculture fish to achieve effective control of the fertility of female fish in aquaculture fish, and protect ecological safety, and has broad application prospects in the field of genetic breeding and ecological safety of aquaculture fish.