'millions of cattle' is grammatically correct and can be used in written English.
You can use it when referring to a large number of cows. For example: "Ranchers in the U.S. midwest typically have millions of cattle grazing on their land."
Millions of cattle have been lost.Rainfall has been low for a decade and, perplexingly, few hurricanes have hit this part of the Gulf coast.
Now millions upon millions of cattle, sheep, and goats dominate and usually degrade the savannas, steppes, and subdeserts, leaving little room for the remaining wild bovids.
Mr. Brown, who interrupted his summer vacation to take charge of the crisis, was eager to avoid the economic disaster of the 2001 outbreak, when millions of cattle and other livestock were slaughtered and burned.
Since the first case was detected in Britain in 1985, this disease that attacks the nervous system has cost the worst-hit countries, notably Britain, millions of cattle and billions of euros in lost beef sales and compensation to farmers.
Using sophisticated databases (including a file of more than 100,000 registered brands) and plain common sense (checking cow pies for tire tracks), these rangers investigate thefts of livestock and property and inspect millions of cattle a year.
The area around the border harbours almost all major productive petroleum wells, in addition to millions of cattle.
At the Bull's Head Drove-yard, 100th Street, several head of cattle were found frozen to death...
In Ireland the growth of tower houses during the 15th century mirrors the rise of cattle herding and the resulting wealth that this brought to many of the lesser lords in Ireland.
In this paper we consider only movements of cattle for the period 1st Jan 2002 to 28th Feb 2005.
To give an overview over the entire study period, the presented metrics were calculated for the network consisting of cattle movements between the 1st January and 31st December 2012.
The generalised linear model output for live cattle imports revealed a significantly increased association between the 16th of any month and the number of cattle imported on that day when compared to the 1st.
