| Tibetan Mastiff is a famous dog in the world, which lives in the cold and anoxic environment-Qingzhang tableland and its adjacent area. Nowadays, Tibetan Mastiff has been introduced in Nanjing, which is in the south of Huai River and belongs to the northern subtropical warm-moist climate and low hilly areas, Whether the Mastiff can live and breed; Whether there are alteration on the physiological characters; If there are differences on growth, development and breeding compared with the Mastiff of Qingzhang tableland. The study also compared Tibetan Mastiff with foreign dogs in the same period and feedlot, and moreover, discussed if the Mastiff can be as a working dog, with a view to protection, breed selection and improvement.In Oct.2000, Tibetan Mastiff was introduced to Nanjing Xigang feedlot from Qinghai province and Tibet autonomous region. With the development, the core flock of selective breeding has been estemblished gradually. The daily gain of male and female mastiff in Nanjing were 150.61g and 135.67g at the age of 100-180 days respectively, which were more than that at the age of 50-100 days and birth to 50 days. The weight of mature mastiff was 47.6kg (male) and 32.08kg (female), which was only the 66.9% and 53.7% of Hequ mastiff respectively, but heavier than that of German shepherd dog, larbrador retriever and English Springer Spaniel remarkably. The height of mature mastiff is 68.4cm (male) and 61.83cm (female), which is 93.44% and 99.41% of Hequ mastiff and higher than that of the three foreign dogs remarkably.In Nanjing, the number of mastiffs born alive was 7.33 in first parity and 5.0 in later parities (2-5), and the number of first parity was more than that of the core flock of Eequ, Hequ group, English Springer Spaniel and German shepherd dog, but less than that of larbrador retriever; The number of 2-5 parities was less than that of the core flock of Hequ, Hequ group, English Springer Spaniel and larbrador retriever, but more than German shepherd dog. In Nanjing, the weaning livability is 6.33 (primiparity) and 4.78 (miltiparity) at the age of 50 days. The number weaned of primiparity was more than that of the core flock of Hequ, Hequ group, English Springer Spaniel and German shepherd dog, bit less than that of larbrador retriever; the number weaned of miltiparity was more than that of German shepherd dog, but less than that of the core flock of Hequ, Hequ group, larbrador retriever and English Springer Spaniel. In Nanjing, the sex ratio of 74 young mastif in 15 litters was 51.35%, and the time of parturition was concentrated on the range from December to January. Among hair color of 43 young mastiffs,76.74% was black,11.63% was yellow,9.3% was gray, and 2.3% was white. The month age of the first parturition was 27, and interval between parturitions was 11.6 months, which more than German shepherd dog, English Springer Spaniel and larbrador retriever. The mating duration of Mastiff last 16.79±4.42min, which longer than that of larbrador retriever, while shorter than that of English Springer Spaniel and German shepherd dog.In summer, the respiration ratio of the mastiff in Nanjing were 36 bpm (male) and 31.67 bpm (female), and in winter, those were 27.5 bpm (male) and 28.67 bpm (female). In summer and winter, the respiration ratio of male mastiff in Nanjing was less than that of subcutaneous fat-rich Larbrador retriever, and more than that of the other two foreign dogs; the respiration ratio of femal mastiff was more than that of the other three dogs in the two seasons.In summer, the heart rate of the mastiff in Nanjing are 118.5 bpm (male) and 107 bpm (female), and in winter, those were108 bpm (male) and 90.67 bpm (female). In summer, the heart rate of male mastiff was nearly to the maximum reference value (120t/min), which more than the other three dogs significantly, and the same to the female. In winter, the heart rate of male mastiff was the same with that of Larbrador retriever, more than that of the other two dogs, the heart rate of female mastiff was more than that of the other three dogs.Routine hematological examination of mastiff in Nanjing was performed and the results showed that the leucocyte was 15.4×109/L(male) and 13.25 X 109/L(female), which was more than 50% and 30% of the reference respectively, this maybe the cause of heat stress response. The mean corpuscular volume and hemoglobin of mastiff were less than the reference remarkably, and also less than that of the other three dogs. It is probably because that Tibetan mastiff lived in a cold anoxic environment and has the characteristics.From now on, the breed selection of Tibetan Mastiff should be focused on the working dog characteristics, high excitability, obedient characteristics and strong willing to get something. According to these, the excellent offspring was selected, and a few generation later, the Tibetan mastiff genealogy suitable for the working dog may be breeded. |
PDF Full Text Request