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At least 1,153 records · Page 64Linked to original sources
PubMed1984

Performance of Canadian Holstein-Friesian cattle in the humid forest zone of Ghana. I. Milk production.

One hundred and three calving records of 35 Canadian Holstein-Friesian cattle introduced in 1974 into Ashanti constituted the data for this study. Age, year, lactation number, season and age X season effects on 305-day yield, lactation length and components of the lactation curve were estimated from 84 complete lactation records. Analysis of variance by General Linear Models Procedure showed significant effect of age and year on all traits studied. Age, year, lactation number, season, concentrate fed and season X age accounted for 61.1, 64.6, 66.9, 68.5 and 38.1% of the variation in 305-day yield, 300-day yield, monthly peak yield, persistency index and lactation length respectively. Age and year significantly affected all traits except lactation length. Lactation number only significantly affected 305-day yield of the traits studied. Season was not an important factor affecting any of the traits. The productive life span of the animals was up to five calvings (eight years). The mean life time milk production was 16,186 kg. Unadjusted means of the 103 records were: 305-day yield 3,878 +/- 93.7 kg; actual 305-yield 4,451 +/- 102.7 kg; total yield 4,225 +/- 160.6 kg; lactation length 332 +/- 14.5 days; days dry 96 +/- 5.9 and total yield per day of calving interval 10.6 +/- 0.33 kg. Performance of Holsteins in Ashanti was better than in most tropical areas.

Analysis of Variance↗
PubMed1997

Effect of age and sex of egg strain chickens and of two stocking densities of broilers on voluntary water intake and performance in a sub-humid environment.

Voluntary water intake and performance of egg-strain chickens of different age groups and sex were compared. Cockerels grew faster and consumed 41% more feed and 43% more water than pullets of the same strain and age. Cockerels of nineteen weeks consumed significantly more feed (P < 0.05) than layers of 30 weeks of the same strain, but there was no significant difference in their daily voluntary water intake. The physiological activities associated with egg laying in chickens, apparently require more water to feed ratio than for the active growth of cockerels. In a second experiment, the effect of 2 stocking densities on voluntary water intake and performance were compared. Birds on higher stocking density (0.09 m2/bird) performed similarly to those on low stocking density (0.18 m2/bird), but the higher stocking density birds recorded slightly higher mortality. Voluntary water consumption was not significantly affected (P > 0.05), although birds on higher stocking density recorded slightly higher average daily voluntary water consumption. The higher stocking density birds recorded slightly higher per cent mortality during the 8 week period, but higher per cent mortality was recorded with the low stocking density birds during the 0 to 4 week brooding period.

Aging↗