scholarly journals RESPONSE TO SELECTION FOR MILK YIELD TRAITS IN EGYPTIAN BUFFALO

2010 ◽  
Vol 47 (2) ◽  
pp. 85-92
Keyword(s):  
Milk Yield ◽  
Yield Traits ◽  
Response To Selection ◽  
Selection For ◽  
Egyptian Buffalo

MILK YIELD IN LINES OF MICE SELECTED FOR GROWTH OR MATERNAL ABILITY

1975 ◽  
Vol 17 (2) ◽  
pp. 263-268 ◽  
Author(s):  
J. M. White
Keyword(s):  
Milk Yield ◽  
Body Weight Gain ◽  
Correlated Response ◽  
Response To Selection ◽  
Litter Weight ◽  
Average Production ◽  
Before And After ◽  
Selection For ◽  
And Control ◽  
Gain Line

Two experiments were conducted to measure milk yield as a correlated response to selection for increased 12-day litter weight (maternal lines) for 13 generations and increased and decreased body weight gain from 21 to 42 days of age (postweaning gain lines) for 12 to 14 generations. Milk yield was measured from day 6 to day 21 of lactation by separating litters from their dams for 6 h, then weighing litters before and after a 1.5 h suckling period. Average total milk production was 30.3 ± 0.9 g and 28.6 ± 1.1 g in maternal and control lines, respectively. This difference was not significant (P > 0.05). Differences among gain lines were significant (P < 0.01) in the second experiment with average production of 44.1 ± 1.4 g for increased gain lines, 22.5 ± 0.9 g for the decreased gain line and 31.2 ± 1.0 g for the control. These results indicated that response to selection for increased 12-day litter weight was not associated with increases in milk yield, but sizable changes in milk yield accompanied bi-directional selection for early postweaning gain.

scholarly journals Response to Selection for Milk Yield in Holsteins

1982 ◽  
Vol 65 (11) ◽  
pp. 2131-2140 ◽  
Author(s):  
O.M. Meland ◽  
R.E. Pearson ◽  
J.M. White ◽  
W.E. Vinson
Keyword(s):  
Milk Yield ◽  
Response To Selection ◽  
Selection For

The extent of selection for milk yield among cows of the Jamaica Hope breed

1970 ◽  
Vol 74 (3) ◽  
pp. 469-471 ◽  
Author(s):  
K. L. Roache ◽  
K. E. Wellington ◽  
P. Mahadevan
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Total Population ◽  
Dairy Herds ◽  
Response To Selection ◽  
Apparent Lack ◽  
Selection For ◽  
The Government ◽  
Using Data ◽  
The Tropics

SUMMARYUsing data (1950–64) from the government-owned herd of Jamaica Hope cattle at Bodles, Jamaica, it was estimated that the fraction of cows called on the basis of their milk production in any given lactation was of the order 0·00 to 0·05. Using data (1967–68) from ten high–and ten low-producing farmer herds of the same breed, it was found that the level of calling was low and that cows proceeding from one lactation to the next had a yield superiority over the total population of only + 4 gallons. It is suggested that one of the principal reasons for the apparent lack of response to selection in dairy herds in the tropics may be that little or no selection for production is in fact practised.

Correlated response to selection for litter size in pigs: II. Carcass, meat, and fat quality traits

2002 ◽  
Vol 80 (10) ◽  
pp. 2566 ◽  
Author(s):  
J. Estany ◽  
D. Villalba ◽  
M. Tor ◽  
D. Cubiló ◽  
J. L. Noguera
Keyword(s):  
Litter Size ◽  
Correlated Response ◽  
Quality Traits ◽  
Response To Selection ◽  
Fat Quality ◽  
Selection For
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