All bitches should be spayed unless being used for breeding.除非是用作种犬，所有的母犬都应摘除卵巢。Warm milk is the ideal breeding ground for bacteria.温牛奶是细菌理想的滋生地。There is potential for selective breeding for better yields.选种培育以提高产量会大有可为。...
...a prize-giving for cattle-breeding.养牛展的颁奖仪式Birth is much,but breeding is more.出身重要,教养更重要。Also needed is more investment in livestock research, such as breeding for hardier animals.同时人们还要加大对家禽研究(例如培育适应性更强的品种)的投资.It...