Abstract. Purpose of research. To estimate the impact of the season and age of the breeding bulls during the period of sperm collection on the main indicators of the own productivity of Holstein bulls. In studies of these indicators and productivity 229 bulls of Holstein breed have studied the effect of age (year of birth), season of the year, as well as the degree of influence of these factors on the value of indicators of productivity of bulls. Methods. Data on the main indicators of own productivity of breeding bulls are analyzed: the volume of ejaculate, the amount and concentration of spermatozoa in 1 ml. The research results were classified by season: winter, spring, summer, and autumn. The values of quantitative indicators of sperm production are given as deviations from the average value for the sample. Statistical analysis was performed using a boxplot diagram with average values and standard deviation (±σ) applied to it. The analysis of variance was performed using the following statistical model: yijk = µ + agej + seasonk + eijk + si. Fischer’s F-test was used to check the significance. Results. Regardless of the season, the values of the ejaculate volume and the total number of sperm in the ejaculate increase with age, and the concentration of sperm in 1 ml decreases. In the spring and summer period, 77–83 % and 66–79 % of observations had high values of the indicator volume of ejaculate and the number of spermatozoa in the ejaculate. In the spring and autumn periods, 62–64 % of observations had high values of sperm concentration in the ejaculate. The year of birth of the producer bull and the producer bull itself have a high degree of influence on the indicators of their own productivity: the volume of ejaculate – 14.94 and 18.22 %; the number of sperm in the ejaculate and their concentration – 8.53–27.88 and 4.51–15.82 %, respectively. Scientific novelty. The data obtained on the influence factors of season, age of the bull-the manufacturer’s figures for their own productivity.
bull, sperm production, volume of ejaculate, season of the year, age of the bull
1. Seydahmetov B. S., Moroz T. A., Panferov V. V., Dunin M. I. Ocenka oplodotvoryayuschey sposobnosti spermy bykov-proizvoditeley // Zootehniya. 2019. № 5. S. 12.
2. Borunova S. M., Iolchiev B. S., Abramov P. N., Badmaev O. E., Tadzhieva A. V., Ribchenko A. S. Effektivnyy metod opredeleniya celostnosti akrosomy spermatozoida u bykov-proizvoditeley // Veterinariya, zootehniya i biotehnologiya. 2017. № 4. S. 29-34.
3. Shidlovskiy A. V., Sheleg I. A. Vliyanie vozrasta bykov-proizvoditeley na pokazateli spermy v RUP «Vitebskoe plempredpriyatie» // Aktual'nye voprosy sel'skohozyaystvennogo proizvodstva: materialy Mezhdunarodnoy nauchno-prakticheskoy konferencii studentov i magistrantov. 2019. S. 199-202.
4. Murphy E. M., Kelly A. K., O’Meara C., Eivers B., Lonergan P., Fair S. Influence of bull age, ejaculate number, and season of collection on semen production and sperm motility parameters in Holstein Friesian bulls in a commercial artificial insemination centre // Journal of Animal Science. 2018. Vol. 96. Rr. 2408-2418. DOI:https://doi.org/10.1093/jas/sky130.
5. Korneenko-Zhilyaev Yu. A. Fiziologicheskiy i selekcionnyy potencial vosproizvoditel'nyh funkciy krupnogo rogatogo skota pod vliyaniem endogennyh i ekzogennyh faktorov: avtoref. dis. … kand. biol. nauk: 03.03.01, 06.02.07 / Yuriy Alekseevich Korneenko-Zhilyaev. Mesto zaschity: FGBNU FNC VIZh im. L. K. Ernsta. Dubrovicy, 2019. 24 s.
6. Vinogradova N. D., Paderina R. V., Shlyapina M. V. Biotehnologicheskie pokazateli kachestva spermoprodukcii bykov-proizvoditeley v OAO «Nevskoe» // Izvestiya Sankt-Peterburgskogo gosudarstvennogo agrarnogo universiteta. 2015. № 39. S. 144-149.
7. Boyko E. V., Koropec L. A. Spermoproduktivnost' bykov-proizvoditeley golshtinskoy porody // Vestnik Bryanskoy gosudarstvennoy sel'skohozyaystvennoy akademii. 2015. № 3-2. S. 4-8.
8. Chetvertakova E. V. Nauchno-prakticheskoe obosnovanie metodov kontrolya pri sovershenstvovanii genofonda krupnogo rogatogo skota Krasnoyarskogo kraya: avtoref. dis. ... d-ra s.-h. nauk: 06.02.07 / Elena Viktorovna Chetvertakova. Mesto zaschity: Krasnoyarskiy gosudarstvennyy agrarnyy universitet. Krasnoyarsk, 2015. 32 s.
9. Bharath Kumar B. S., Pandita S., Sharma A., Jadhav V. Regulation of postnatal development of testes and its association with puberty and fertility // Agricultural Review. 2015. Vol. 36. Iss. 4. Pp. 339-344. DOI:https://doi.org/10.18805/ag.v36i4.6671.
10. Sabés-Alsina M., Lundeheim N., Johannisson A., López-Béjar M., Morrell M. J. Relationships between climate and sperm quality in dairy bull semen: A retrospective analysis // Journal of Dairy Science. 2019. Vol. 102. No. 6. Rr. 5623-5633. DOI:https://doi.org/10.3168/jds.2018-15837.
11. Iskandarov D. V., Bagmanov M. A., Yusupov S. R. Porodnye i sezonno-vozrastnye osobennosti kachestva spermy bykov-proizvoditeley v GUP UR «Mozhgaplem» // Uchenye zapiski Kazanskoy gosudarstvennoy akademii veterinarnoy mediciny im. N. E. Baumana. 2015. T. 222 (2). S. 110-115.
12. Golubkov A. I., Adzhibekov V. K., Golubkov A. A., Mirvaliev F. S., Shadrin S. V., Chetvertakova E. V., Popov F. V., Sirotinin E. G. Vosproizvoditel'naya sposobnost' bykov-spermodonorov raznogo geneza // Vestnik KrasGAU. 2018. № 4. S. 86-93.
13. Malama E., Zeron Y., Janett F., Siuda M., Roth Z., Bollwein H. Use of computer-assisted sperm analysis and flow cytometry to detect seasonal variations of bovine semen quality // Theriogenology. 2017. Vol. 87. Pp. 79-90.
14. Staub C., Johnson L. Review: Spermatogenesis in the bull // Animal. 2018. Vol. 12:S1. Pp. 27-35. DOI:https://doi.org/10.1017/S1751731118000435.
15. Rahman B. M., Schellander K., Llamas N., Van Soom A. Heat stress responses in spermatozoa: Mechanisms and consequences for cattle fertility // Theriogenology. 2018. Vol. 113. Pp. 102-112. DOI:https://doi.org/10.1016/j.theriogenology.2018.02.012.
16. Abilov A. I., Amerhanov H. A., Korneenko-Zhilyaev Yu. A., Pyzhova E. A., Kombarova N. A., Vinogradova I. V., Ye E.-H. Kachestvennye i kolichestvennye pokazateli semeni u bykov-proizvoditeley v zavisimosti ot atmosfernogo davleniya v den' vzyatiya eyakulyatov // Sel'skohozyaystvennaya biologiya. 2017. T. 52. № 2. S. 314-322. DOI:https://doi.org/10.15389/agrobiology.2017.2.314rus.
