Usually when the days start shortening. It has to do with the amount of hours of sun light. Goats want to kid in the winter when their are less germs and pests to attack their babies fragile immune systems. Some breeds can come into heat any time a buck is in rut. Most bucks can not produce sperm in very hot weather, so again usually when the daylight stays waning.
Estrus in a cow or heifer only lasts for ~24 hours.
21 days
The length of estrous for cattle is approximately 21 days. The estrus period last about 18 hours.
A female dog's heat cycle or estrus typically lasts around 2-4 weeks. This cycle is divided into four stages: proestrus, estrus, diestrus, and anestrus. During the estrus stage, which is when she is fertile, the female dog may actively seek out males for breeding.
Anestrus or Diestrus. Proestrus is when the female is about to go into estrus, and Metestrus is the period before Diestrus and after Estrus which the female goes out of heat and ovulation ends.
Estrus in a cow or heifer only lasts for ~24 hours.
21 days
9 weeks to 2 months
As long as there are does in heat.
according to http:/wwwzperiodzcalzperiodznet/~pamgreen/length_of_estruszperiodzhtml about 3-4 weeks
Same amount for a beef cow: estrus is around 24 hours. Estrous is 21 days long.
2
Mice are in estrus for a period of about 10 to 12 hours, and they will go into estrus every 3 or 4 days.
The American street goat has a long lasting interior
The length of estrous for cattle is approximately 21 days. The estrus period last about 18 hours.
Wait for 12 hours after you've last seen her estrus activity before AI'ing a heifer or cow.
If in a foil package about a week. If in brine at least a month.