Influence of Body Size During Lactation on Level of Milk Production

Hickman, Clare; Lee, A. J.; Slen, S. B.; Kozub, G. C.

doi:10.4141/cjas71-044

Can. J. Anim. Sci.

1971

DOI: 10.4141/cjas71-044

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Influence of Body Size During Lactation on Level of Milk Production

Clare Hickman¹,

A. J. Lee²,

S. B. Slen³

et al.

Abstract: ABSTRACT

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1972

1987

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Cited by 6 publications

References 12 publications

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The effect of body weight at calving on milk production and reproductive performance of Friesian × Zebu heifers

Deresz¹,

Jaume²,

Carvalho³

et al. 1987

Anim. Sci.

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Twenty-six pregnant Holstein-Friesian x zebu heifers, arranged in pairs according to age, body weight, expected calving date and amount of zebu breeding, were allocated at random to two nutritional regimens during the last 12 weeks before calving. Ifc was planned that the animals in treatment A should calve at a pre-calving live weight of 480 kg and those in treatment B should calve at 380 kg. The diet consisted of maize silage or elephant grass silage, soya-bean meal and minerals. During the first 21 days of the post-partum period both groups were given 6 kg concentrate per head daily. After this period, the feeding level was adjusted every 14 days according to the current milk yield. The mean total milk yields were 2132 kg and 1283 kg (P < 0-05) and the lengths of lactation were 239 days and 156 days (P < 0-01) for cows in treatments A and B, respectively. There was no statistically significant difference between treatments in the intervals from calving to first heat or calving to conception.

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The effect of body weight at calving on milk production and reproductive performance of Friesian × Zebu heifers

Deresz¹,

Jaume²,

Carvalho³

et al. 1987

Anim. Sci.

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Feed intake and production in dairy breeds dependent on the ration.

Korver¹

1984

NJAS

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In 2 lactations and the dry period, with a changeover between lactations, Dutch Black Pied (DBP), Holstein-Friesian (HF) and DBP/HF crosses with 50% and 75% HF were offered roughage to appetite and 570 or 2310 kg concentrates per lactation. Energy intakes in the 2 lactations were 21 and 27% lower and roughage intakes 22 and 17% higher for cows given low-concentrates vs. high-concentrates; there was no carryover effect from lactation into the dry period when all cows received the same amount of concentrates. HF cows had higher roughage intakes than DBP by 4-5% but differences were only significant in late lactation. HF cows gave 10.1 and 7.2% (594 and 407 kg) more milk and 7.7 and 3.7% more milk energy than DBP cows in the 2 lactations resp.; this contrasts with a yield superiority of HF cows by 15% (974 kg) in the preceding lactation when concentrates were given according to milk yield. Milk yield was 20% (1250 kg) higher with high- than with low-concentrate; a carryover effect was noted at the beginning of the 2nd lactation. Efficiency of energy conversion to milk yield was significantly affected by ration at the beginning of lactation. Breed x ration interaction effects were not significant for intake or milk yield. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Age and Herd Adjustment of First Lactation Milk Yield

Lee¹,

Hickman²

1972

Journal of Dairy Science

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Influence of Body Size During Lactation on Level of Milk Production

Abstract: ABSTRACT

Cited by 6 publications

References 12 publications

The effect of body weight at calving on milk production and reproductive performance of Friesian × Zebu heifers

The effect of body weight at calving on milk production and reproductive performance of Friesian × Zebu heifers

Feed intake and production in dairy breeds dependent on the ration.

Age and Herd Adjustment of First Lactation Milk Yield

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