منابع مشابه
Fixed-time artificial insemination in beef cattle
BACKGROUND The study was designed to test the effect of fixed-time artificial insemination (fixed-AI) after the slightly modified Ovsynch protocol on the pregnancy rate in beef cattle in Finnish field conditions. The modification was aimed to optimize the number of offsprings per AI dose. METHODS Ninety Charolais cows and heifers were entered into the program an average of 1.8 times. Thus, 16...
متن کاملThe Cattle Artificial Insemination Industry in Malaysia
Artifi cial insemination (AI) technology is the most effective tool for genetic improvement in cattle. The AI service began in the 1960’s and the number of annual cattle AI’s has been steadily increasing up to 1990, after which it gradually dropped for about a decade. Since 2001 however there has been a modest recovery in the number of AI cases. In 2009 AI coverage stood at 4.2%. To rapidly imp...
متن کاملExperiences in Artificial Insemination of Beef Cattle in North Queensland
Artificial insemination was used in an attempt to breed three groups of Brahman cross cows on two properties in north Queensland. On one property the attempt was abandoned due to low incidence of detected oestrus in lactating cows. On the other property calving rates following insemination were 20.8% and 16.4% over two years. Vibriosis was one cause of low fertility. Semen was collected satisfa...
متن کاملSynchronization of Bos Indicus-influenced Cattle for Timed Artificial Insemination
Developing successful methods for synchronizing estrus and ovulation in cattle has been a major research interest for at least the last 35 yr. Early objectives focused on the control of the corpus luteum (CL) and artificial insemination (AI) relative to estrus. Ultimately, the goal has been to achieve precise synchronization of ovulation so that cattle can be inseminated without regard to estru...
متن کاملSome Problems Associated with Artificial Insemination of Beef Cattle
In October, 1964, beef cows were divided into three groups. One group was run with bulls for four months (group 1); another group was kept free of bulls and was observed daily for six weeks and cows detected in oestrus were inseminated using chilled semen (group 2); and the third group was given progestagens to synchronise ovarian cycles and the cows were inseminated after treatment and again a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1961
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(61)90062-5