| With the continuous development and improvement of China's police system,police dogs play an important role in police work.The breeding performance of police dogs is an important factor to maintain the stability of the number of police dogs in service.D ue to China's vast territory and significant regional climate differences,it is difficult to make standard evaluation and management system for the breeding performance of police dogs,resulting in low breeding performance of police dogs in many regions and insufficient reserve dogs.Therefore,it is imperative to formulate targeted regional police dog breeding management programs.As the larger police dog breeding base in heilongjiang province,heihe police dog breeding center has the particularity of cold region in climate and environment.Taking the police dog of heihe police dog breeding center as the research object can provide reference for the police dog breeding in cold region.The main work of this paper is as follows:(1)The relationship between estrus and season in German shepherd female dogs.German shepherd dogs had the lowest average number of estrus days in the first quarter and the highest number in the second quarter.In the first three quarters,the number of despatched dogs was more,while in the second and fourth quarters it was less.German shepherd dogs had a higher mating success rate in the first three quarters than in the second and fourth quarters,and had the highest mating success rate in the first quarter.However,the average lit ter size showed the opposite trend,and the litter size in the second and fourth quarters was better than that in the first and third quarters.(2)The relationship between estrus and environment in German shepherd females.There is also a direct relationship between female estrus and air temperature.German shepherd dogs reach the maximum estrus rate in air temperature of 20-30?.The peak estrus rate is reached at 36-50 humidity.(3)The relationship between estrus and dog age.At the age of 5,the size of the litter and the number of days in estrus are optimal.(4)The relationship between estrus and breeding mode of German shepherd female dogs.According to intensive unified breeding and family breeding methods,100 GSD female dogs were randomly selected.The days of estrus in intensive unified breeding and family breeding modes were 12.69 days and 13.45 days respectively.The pups' survival rates were 74.12% and 90.45%,respectively,under intensive and unified breeding and family-oriented breeding modes.The litter size of German shepherd females in intensive unified breeding and family breeding modes is 6.12 and 6.78 respectively.(5)The rules of estrus hormone secretion in German shepherd female dogs.It is provided and raised by heihe police dog training center.Choose the estrus cycle normal,everyday observation index of normal GSD bitches only 20,guarantee the up and down at the age of five dogs age,weight around 30 kg,after physical examination to digital serial number of the female,respectively in the corresponding dog kept separately in the cage,keep enough sunlight and water,during breeding fodder for daily diet standard goods.Venous blood samples were collected 0-20 days after the start of the experiment to prepare for radioimmunoassay.Ser um concentrations of E2,P and LH were determined.The procedure and calculation method of hormone detection were performed according to the kit instructions.At last,the interaction and secretion of LH,P and E2 in serum of female dogs in pre-estrus,estrus and late estrus were analyzed.Through the above work can effectively explore the heihe city police dog training center German herding dogs estrus macro environmental rules and estrus hormone secretion. |
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