https://padlet.com/connorsturdy/tp5qyp7paqbm Connor Sturdy AGR 286 en-us 2016-10-06 15:06:04 UTC 2025-09-29 02:44:00 UTC hello@padlet.com connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129882017 Bulls use olfactory and vision to detect which cows are sexually receptive. Cows in heat attract the attention of bulls by displaying such visual cues as mounting, being mounted or a posture involving arching of the back and elevation of the tail. Once bull is with cow, the bull sniffs the vulva to determine whether the cow in in heat. ]]> 2016-10-11 16:35:31 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129882017 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129895487 Male:Female ratios appear to have minor effects on libido and fertility. Multiple matings with the same or different bulls may reduce the duration of oestrus. Dominant bulls may achieve more matings at pasture, but this is not necessarily shown in their fertility. There is evidence of breed differences in expression of libido, but this appears to not be demonstrated in fertility. There is evidence that bulls and females prefer to mate with similar genotypes/phenotypes with implications for fertility. ]]> 2016-10-11 17:06:03 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129895487 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129911878 In two herds of less than 15 cows no mounting by cows occurred. In those herds sniffing of the vulva appeared to be the only method of heat detection that bulls used. When herds of 13-49 cows had no cows in heat, no mounting by cows was observed. On these days bulls sniffed the vulva of 95% of cows in the herds. On days when 1 or 2 cows were in heat a significantly smaller proportion of cows, 73% were inspected for heat in this way. In herds of 62-124 cows, bulls appeared to detect heat in cows by seeing mounting cows within the sexually active groups rather than sniffing of vulva.]]> 2016-10-11 17:40:09 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129911878 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129919260 Traits associated with mating behavior are strongly influenced by genetic factors and vary widely among individuals. Visual cues are of greater importance when compared to olfactory cues in eliciting male sexual response. Bulls tend to distribute their services among receptive females within their genetic limitations with females newly in estrus being most attractive to the males. Social interactions among males in multi-sire groups can influence the reproductive performance of both individual males and the female herd. Single sire breeding, while potentially more efficient than multi-sire breeding, is dependent upon the reproductive capabilities of the sire.]]> 2016-10-11 17:56:06 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129919260 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129926201 A rapid, accurate method of estimating the social dominance order (SDO) in a bull group was developed. It found that a bull's ranking in a group with a stable SDO was significantly related to its sexual activity but it was not in a group with an unstable SDO, and seniority, and to a lesser extent age, maintained the social ranking in mixed-age group of bulls. Mixed-age groups of bulls when mated to cow herds achieved lower pregnancy rates than groups of bulls of the same age. ]]> 2016-10-11 18:11:05 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129926201 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129933482 If one yearling bull is put out to pasture, there may be decreased early season conception rates. Social dominance in pastures with more than one bull can cause concern. If older bulls have been used more than two breeding seasons, they have a tendency to become territorial and may spend more time fighting and defending their territory than servicing cows. Observation is key when dealing with mating behavior of cattle. In situations where it is possible to rotate groups of young bulls with the cow herd, this should be utilized. As single yearling bulls should not run with cattle for longer than 70 days. Ideally a 60-90 day breeding season is best to ensure similar calf ages and weights at weaning. 1 in 5 beef bulls are questionable or unsatisfactory as a breeding bull. 
(From pages 111-113)]]> 2016-10-11 18:27:41 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129933482 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129942420 A- Chemical or olfactory communication
B- Visual communication 
C- Auditory communication
D- Tactile communication
E- Motor clues (Posture & Movement]]> 2016-10-11 18:50:01 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129942420 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129944951 Hereford bull showing Flehmen response or the curling back of his upper lip exposing the front teeth while holding the position for several seconds.]]> 2016-10-11 18:57:05 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129944951 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129952824 Yearling bulls have the lowest overall pregnancy rate percentage while having the highest number of mounts, services, and females in estrus serviced; when compared to bulls of the age of 2 and 3+. Bulls 3+ maintain the highest overall pregnancy rate percentage after a five-day breeding period. ]]> 2016-10-11 19:20:05 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129952824 connorsturdy https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129955945 Here the female is showing she is in heat by raising her tail. While the bull continues to test her to see if she is ready to be bred by resting his chin on top of the females back to simulate being mounted. She continues to stand and not walk away while he is "feeling her out" so he proceeds to mount the female for breeding. ]]> 2016-10-11 19:30:44 UTC https://padlet.com/connorsturdy/tp5qyp7paqbm/wish/129955945