Testicular Parameters and its Influence in Buffaloes (Bubalus buballis)  Sexual Behaviour

During the selection of parents of future bulls of meat breeds, the problem of improving the main signs of meat productivity is a priority. Search for techniques that would additionally influence the effectiveness of using future bulls using conventional breeding methods determines the relevance of this study. The purpose of the study was to determine the influence of the selection of parent pairs based on antigens of the B blood group system on the results of lifelong use of bulls of Ukrainian beef cattle, created by the method of the complex reproductive crossing of four different breeds. The study was conducted by comparing the performance of bulls assigned to different groups by the antigenic similarity index (ras) of their parents. By ras value over 0.150 formed a group of progenies from a homogeneous selection of parents (n=5). In the group from a heterogeneous selection of parents (n=5), the indicator ras less than 0.150. The libido of bulls was tested in the arena by the time of manifestation of sexual reflexes when receiving sperm on an artificial vagina. Within the groups, the age of bulls at the time of first sperm collection, life and productive use, the number of ejaculates received and culled, and the quality and fertilising ability of sperm were determined. It was identified that in bulls obtained from the homogeneous selection of parents by ras compared to peers from heterogeneous mating, there is a tendency to increase the age of initiation of sperm collection by 33.9%. They also have a longer productive use expectancy by 6.3% and a longer life expectancy by 21.5%. Bulls obtained from heterogeneous selection during use have more leads to the scarecrow by 13.6% and predominate in the number of ejaculates obtained. The percentage of ejaculate culled is twice as high. Bulls from homogeneous selection have a higher (by 15.3 points) share of active manifestation of sexual reflexes, a larger volume of ejaculate, better indicators of sperm motility and concentration, fewer culled ejaculates, and a higher fertilisation capacity of sperm by 18.2 points. The results obtained should be used in the selection of bulls for potential mothers of valuable bulls of the Ukrainian beef breed and in other livestock populations created by the method of complex reproductive crossing

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Influence of body structure types and pronouncement of meat forms of bulls on their sexual activity

Ugnivenko¹,

Коропец²

2021

animal

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In beef cattle breeding, the reproductive capacity of bulls significantly affects the economic efficiency of production. Selection for the meat productivity can negatively affect the ability of bulls to reproduce, so it is necessary to consider the risks of such a connection when selecting them. The study determined the rate of manifestation of Ukrainian beef breed bulls sexual reflexes of different body types and severity of meat forms. According to the type of body structure of bulls divided into two groups: large (high and long-bodied) and compact (low and short-bodied). The distribution performed using the growth index. The severity of meat forms of bulls was determined at 15 months of age on a 60-point scale. The animals on meat forms divided into two groups compared with the average score of experimental bulls. The degree of sexual activity manifestation assessed by the duration of sexual reflexes from bringing the bools to the stuffed animal to the mating attempt. According to the manifestation of libido, animals divided into three groups: active – mating attempt to cage from 10 to 60 seconds, moderate – from 60 to 120 seconds and slow – the time before the mating attempt lasted more than 120 seconds. Subsequently, in experimental bulls recorded the duration of productive use period, the number of leads to the stuffed animal and mating attempts to it and the number of received and rejected ejaculates. It found that the tendency of the distribution of active moderate and slow manifestation of sexual reflexes in bulls of different body types and development of meat forms is similar. In bulls of different groups, moderate sexual activity most often observed, but specific tendencies observed within the groups. The share of high sexual activity was higher in compact bulls compared to large coeval animals. Among animals grouped by the development of meat forms, the share of high sexual activity higher in bulls with better expressed meat forms. In the future, large bulls tend to increase the duration of productive use, predominate in the share of mating attempt and are characterized by a decrease in the share of ejaculate culling. Bulls with better meat forms tend to increase the duration of productive use due to their higher breeding value in terms of meat productivity. No difference was found in the proportion of mating attempts and the percentage of culled ejaculates between animals with different manifestations of meat forms. The obtained results prove that for intensive use at a young age more suitable bulls of compact type, and in adulthood more effective large sires. Better development of meat forms somewhat reduces the sexual activity of young bulls. At a more mature age, the results of the use of bulls are practically unaffected by meat forms.

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Testicular Parameters and its Influence in Buffaloes (Bubalus buballis) Sexual Behaviour

Cited by 3 publications

References 8 publications

Scientific and practical justification of the optimal expression of meat forms of cattle

Scientific and practical justification of the optimal expression of meat forms of cattle

Lifetime productivity of bulls depending on the similarity of their parents by antigens of the B blood group system

Influence of body structure types and pronouncement of meat forms of bulls on their sexual activity

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