The effect of age at first calving on the milking performance of primiparous Jersey cows
<b>The aim of this study was to determine the effect of age at first calving on the milking performance of primiparous Jersey cows (261 cows). Analyses were conducted on 2461 test day milking samples from 17.09.2007 to 26.07.2016. The primiparous cows were divided into four groups according to...
Guardado en:
| Autores principales: | , |
|---|---|
| Formato: | article |
| Lenguaje: | EN PL |
| Publicado: |
Polish Society of Animal Production
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/c6b488c855a84ba29505ed7e703f8504 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| id |
oai:doaj.org-article:c6b488c855a84ba29505ed7e703f8504 |
|---|---|
| record_format |
dspace |
| spelling |
oai:doaj.org-article:c6b488c855a84ba29505ed7e703f85042021-11-10T16:57:20ZThe effect of age at first calving on the milking performance of primiparous Jersey cows1733-73052719-393410.5604/01.3001.0014.9406https://doaj.org/article/c6b488c855a84ba29505ed7e703f85042021-06-01T00:00:00Zhttp://zootechnical.com/gicid/01.3001.0014.9406http://zootechnical.com/gicid/pdf/01.3001.0014.9406https://doaj.org/toc/1733-7305https://doaj.org/toc/2719-3934<b>The aim of this study was to determine the effect of age at first calving on the milking performance of primiparous Jersey cows (261 cows). Analyses were conducted on 2461 test day milking samples from 17.09.2007 to 26.07.2016. The primiparous cows were divided into four groups according to their age at first calving (≤ 24, > 24–26, > 26–28, > 28 months), and their daily milk yields were compared. Fourfold contingency tables were prepared to investigate the distribution of the population of cows calving at different ages and the peak daily milk yield. The significance of the association between factors was estimated using Fisher's exact test. To illustrate the course of 305-day lactation in primiparous cows varying in age at first calving, linear graphs were plotted with linear trends for daily milk yields. Primiparous Jersey cows calving at the age of > 26–28 months of life had the highest daily milk yield. In terms of the contents of basic milk constituents in the first lactation, the most advantageous age at first calving was > 24–26 months of life. However, a younger age at first calving (≤ 24 months) was associated with a lower somatic cell count in milk as well as a more favourable lactation curve for daily milk yield. The results of the study may suggest that Jersey cows calving at an earlier age (up to 24 months) may have a longer productive life and thus better performance parameters. Jarosław PytlewskiIreneusz Ryszard AntkowiakPolish Society of Animal ProductionarticleJersey cattleage at first calvingmilking performanceZoologyQL1-991ENPLRoczniki Naukowe Polskiego Towarzystwa Zootechnicznego, Vol 17, Iss 2, Pp 7-16 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN PL |
| topic |
Jersey cattle age at first calving milking performance Zoology QL1-991 |
| spellingShingle |
Jersey cattle age at first calving milking performance Zoology QL1-991 Jarosław Pytlewski Ireneusz Ryszard Antkowiak The effect of age at first calving on the milking performance of primiparous Jersey cows |
| description |
<b>The aim of this study was to determine the effect of age at first calving on the milking performance of primiparous Jersey cows (261 cows). Analyses were conducted on 2461 test day milking samples from 17.09.2007 to 26.07.2016. The primiparous cows were divided into four groups according to their age at first calving (≤ 24, > 24–26, > 26–28, > 28 months), and their daily milk yields were compared. Fourfold contingency tables were prepared to investigate the distribution of the population of cows calving at different ages and the peak daily milk yield. The significance of the association between factors was estimated using Fisher's exact test. To illustrate the course of 305-day lactation in primiparous cows varying in age at first calving, linear graphs were plotted with linear trends for daily milk yields. Primiparous Jersey cows calving at the age of > 26–28 months of life had the highest daily milk yield. In terms of the contents of basic milk constituents in the first lactation, the most advantageous age at first calving was > 24–26 months of life. However, a younger age at first calving (≤ 24 months) was associated with a lower somatic cell count in milk as well as a more favourable lactation curve for daily milk yield. The results of the study may suggest that Jersey cows calving at an earlier age (up to 24 months) may have a longer productive life and thus better performance parameters.
|
| format |
article |
| author |
Jarosław Pytlewski Ireneusz Ryszard Antkowiak |
| author_facet |
Jarosław Pytlewski Ireneusz Ryszard Antkowiak |
| author_sort |
Jarosław Pytlewski |
| title |
The effect of age at first calving on the milking performance of primiparous Jersey cows |
| title_short |
The effect of age at first calving on the milking performance of primiparous Jersey cows |
| title_full |
The effect of age at first calving on the milking performance of primiparous Jersey cows |
| title_fullStr |
The effect of age at first calving on the milking performance of primiparous Jersey cows |
| title_full_unstemmed |
The effect of age at first calving on the milking performance of primiparous Jersey cows |
| title_sort |
effect of age at first calving on the milking performance of primiparous jersey cows |
| publisher |
Polish Society of Animal Production |
| publishDate |
2021 |
| url |
https://doaj.org/article/c6b488c855a84ba29505ed7e703f8504 |
| work_keys_str_mv |
AT jarosławpytlewski theeffectofageatfirstcalvingonthemilkingperformanceofprimiparousjerseycows AT ireneuszryszardantkowiak theeffectofageatfirstcalvingonthemilkingperformanceofprimiparousjerseycows AT jarosławpytlewski effectofageatfirstcalvingonthemilkingperformanceofprimiparousjerseycows AT ireneuszryszardantkowiak effectofageatfirstcalvingonthemilkingperformanceofprimiparousjerseycows |
| _version_ |
1718439918026358784 |