Features of heritable signs of milk yield by daughters of Holstein breed cows

UDC 636.2:636.082.4

E. Zaitsev

The presence of various factors of influence on breeding grounds, depending on the genetic potential of livestock breeds and the productivity of herds, determines the systematic and concreteness of assessing the inheritance of the signs.
As a result of the conducted researches it was established that from the cows-mothers of this level of daughters is received with different productivity. Most of the daughters in terms of breastfeeding prevail over their mothers, with the exception of groups with a tune of «8554-9372» and «>9373». There is a phenomenon where the hereditary quality of the uterus does not manifest itself in the next generation, despite the fact that they are mating with the highly valuable buds-pedigrees. However, the descendants obtained from cows with a level of milking «<8553» are better in terms of performance than their mothers. The comparative analysis was also found that the daughters with a high milk yield of 929 kg(P>0.99) were compared with the mothers with the highest amount of milking in the group «>9373». This indicates that at a higher level of support for cows, the genetic potential of productivity appears more clearly.
Confirmation of this tendency is to determine the coefficients of inheritance. They characterize the influence of mothers on the share of the hereditary component in the phenotypic variability of the characteristics of the studied population. It was established high, middle and low stages of inheritance of the signs of milk production of Holstein breed animals.
Consequently, it was revealed patterns of inheritance of the signs of milk productivity indicate the possibility of effective selection for mass selection of cows with high productivity.

Keyword: cows, mothers, daughters, sign, correlation, heritableness.

Features of heritable signs of milk yield by daughters of Holstein breed cows.

Issue 4 (96), 2017

Correlative changeability of selective signs of suckling cattle Holstein breed

UDC 623.2.082

E. Zaitsev

In the selection of suckling cattle are widely used phenotypical and genetic cross-correlation connections between the signs of productivity, determination of which allows using them for intensification of breeding process.
By comparative analysis it was set that all investigated signs are characterized by the positive correlation of low degree and only the content of fat in milk was the negative coefficient of correlation (r = – 0,17 P>0,95). About the change in the character of interdependence which arisen under influence of selection is characterized the coefficient of correlation between the amount of mothers’ milk protein and an amount of milk protein of their daughters (r = 0,17 P>0,95).
In the process of selection negative correlation was diminished between yield and content of protein in milk. This, for the I GEР the coefficient of correlation was – 0,16 (P>0,95), and in the ІІ GEP his value was only – 0,07 (P<0,95). It was established the positive connection between the content of fat and protein in milk, although the size of correlation is more in the second genetic-ecological generation (r = 0,21 P>0,99).
So, it is proved the connection between content of protein in milk yield of mothers and daughters was higher in the group of the most productive mothers (r = 0,35 P>0,99). It is found that greater coefficients of correlation was set between the yield of mothers and yield of daughters, between an amount of milk protein of mothers and their daughters in the group of less productive mothers (r = 0,29 P>0,99 and r = 0,29 P>0,99 accordingly).
Thus it was determined the presence of connection between the signs of the suckling productivity in the animals of Holstein breed in two genetic-ecological generations. The investigated signs are characterized by the different values of coefficients in correlation and strength of connection.

Key words: breed, cows, mothers, daughters, productivity, sign, correlation.

Correlative changeability of selective signs of suckling cattle Holstein breed.

References:
1. Selektsiya molochnoyi khudoby i svyney : navch. posib. / [T. V. Pidpala, S. A. Voynalovych, V. H. Nazarenko ta in.] ; za red. profesora T. V. Pidpaloyi. – Mykolayiv : MNAU, 2012. – 297 s.
2. Pidpala T. V. Spivvidnosna minlyvist’ oznak pry tandemniy selektsiyi molochnoyi khudoby / T. V. Pidpaloyi // Tvarynnytstvo Ukrayiny. – 2007. – № 5. – S. 22–24.
3. Эrnst L. K. Krupnomasshtabnaya selektsyya v skotovodstve / L. K. Эrnst, A. A. Tsalytys. – M. : Kolos, 1982. – 238 s.
4. Dyn’ko Yu. P. Selektsiyno-henetychni parametry molochnoyi produktyvnosti i zhyvoyi masy pervistok ukrayins’koyi chorno-ryaboyi molochnoyi porody / Yu. P. Dyn’ko // Visnyk Sums’koho natsional’noho ahrarnoho universytetu : naukovyy zhurnal : seriya «Tvarynnytstvo». – Sumy, 2016. – V. 5 (29). – S. 51–54.
5. Suprun I. O. Selektsiyno-henetychni parametry koriv ukrayins’koyi chervono-ryaboyi molochnoyi porody / I. O. Suprun // Visnyk Sums’koho natsional’noho ahrarnoho universytetu : naukovo-metodychnyy zhurnal : seriya «Tvarynnytstvo». – Sumy, 2002. – V. 6. – S. 211–214.
6. Plokhynskyy N. A. Rukovodstvo po byometryy dlya zootekhnykov / N. A. Plokhynskyy. – M. : Kolos, 1969. – 256 s.
7. Fedorovych Ye. I. Selektsiyno-henetychni parametry ta biolohichni osoblyvosti chorno-ryaboyi khudoby zakhidnoho rehionu Ukrayiny / Ye. I. Fedorovych, Y. Z. Sirats’kyy // Visnyk Sums’koho natsional’noho ahrarnoho universytetu : naukovo-metodychnyy zhurnal : seriya «Tvarynnytstvo». – Sumy, 2002. – V. 6. – S. 219–222.
8. Vechorka V. V. Otsinka produktyvnykh yakostey tvaryn holshtyns’koyi porody kanads’koyi selektsiyi zalezhno vid henotypovykh i paratypovykh faktoriv : avtoref. dys. na zdobuttya nauk. stupenya kand. s.-h. nauk : spets. 06.02.01 «Rozvedennya ta selektsiya tvaryn» / V. V. Vechorka. – Kherson, 2010. – 20 s.
9. Hyl’ M. Zumovlenist’ molochnoyi produktyvnosti doslidzheno na korovakh holshtyns’koyi porody / M. Hyl’, I. Halushko // Tvarynnytstvo Ukrayiny. – 2007. – № 5. – S. 9-10.
10. Pidpala T. V. Otsinka ukrayins’koyi chervonoyi molochnoyi porody za selektsiyno-henetychnymy parametramy / T. V. Pidpala, O. K. Tskhvitava // Visnyk ahrarnoyi nauky Prychornomor”ya. – Mykolayiv: MDAU, 2007. – V. 4 (43). – S. 169–175.
11. Demchuk M. P. Hospodars’ko-korysni oznaky khudoby yevropeys’koyi selektsiyi / M. P. Demchuk // Visnyk Sums’koho natsional’noho ahrarnoho universytetu : naukovo-metodychnyy zhurnal : seriya «Tvarynnytstvo». – Sumy, 2002. – V. 6. – S. 96–99.

Issue 4 (92), 2016