View Full Document. ï¬ 1  Primers determine the specificity of the PCR reaction. ï¬ The distance between the primer binding sites will determine the size of the PCR product. 2  T m ï¬ For short (14â20 bp) oligomers: ï¬ T m = 4Â° (GC) + 2Â° (AT)
Estrus, or heat, is the period in which the doe will stand and allow the buck to breed her. This phase of the reproductive cycle may last between 12 to 36 hours. The period from one heat cycle to the next is referred to as the estrous cycle. In goats, the estrous cycle occurs every 18 to 24 days, or 21 days on average.
For goats, it's every 21 days from July through December. A fairly short window of opportunity exists for breeding -- between 24 and 36 hours. This typically occurs the day before the new breeding cycle starts. For example, if your ewe's body follows a 17-day heat cycle, she's most likely to get pregnant on day 16.or goats, it's every 21 days from July through December. A fairly short window of opportunity exists for breeding -- between 24 and 36 hours. This typically occurs the day before the new breeding cycle starts. For example, if your ewe's body follows a 17-day heat cycle, she's most likely to get pregnant on day 16.