| Autor: |
Marek Sady, Sylvia Kehoe, P. Micek, Paweł Górka, Patrycja Rajtar |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Annals of Animal Science. 22:237-254 |
| ISSN: |
2300-8733 |
| Popis: |
Grain from traditional varieties of rye is not commonly used in dairy cattle nutrition. However, new hybrid varieties of rye currently available are characterized by some nutritional and agrotechnical benefits. This paper deals with the hypothesis that rye grain derived from a hybrid variety may be an alternative for maize grain in diets for dairy cattle. Sixteen lactating Polish Holstein- Friesian cows were divided into two groups according to their parity (8 primi- and 8 multiparous), stage of lactation (106 ± 30 days after calving) and milk yield (34 ± 4 kg/day). Cows were fed a total mixed ration (TMR) containing grass silage and whole crop maize silage and 29.2% of the concentrate (in dry matter). The latter contained approximately 48% (as fed) of either maize grain (M) or hybrid rye grain (HR) as a main source of cereal grain. Experimental diets were fed for 9 weeks. The use of HR as a substitute for M did not affect (P>0.05) dry matter intake and milk yield. There were no differences between treatments in the content of milk solids, amino acids, and fatty acid profile. However, substituting M by HR positively influenced composition of milk protein fractions by increasing the proportion of α-casein (37.0 vs 39.7%; P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
