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http://en.wikipedia.org/wiki/Chianina
The Chianina is both the tallest and the heaviest breed of cattle. Mature bulls stand up to 1.8 m (5 ft 11 in), and castrated oxen may reach 2 m (6 ft 7 in).[11] It is not unusual for bulls to exceed 1,600 kg (3,500 lb) in weight.[1] Males standing over 1.51 m (4 ft 11 in) at 12 months are considered top-grade. A Chianina bull named Donetto holds the world record for the heaviest bull, reported by one source as 1,740 kg (3,840 lb) when exhibited at the Arezzo show in 1955,[12] but as 1,780 kg (3,920 lb) and 1.85 m (6 ft 1 in) tall at the age of 8 by others including the Tenuta La Fratta, near Sinalunga in the province of Siena, where he was bred.[13][14] Cows usually weigh 800–900 kg (1,800–2,000 lb), but commonly exceed 1,000 kg (2,200 lb); those standing over 1.65 m (5 ft 5 in) are judged top-grade. Calves routinely weigh over 50 kg (110 lb) at birth.[1]