Performance of the dairy herd of DTRI, U.P. at Los Baños 1962-1977

Date

3-1979

Abstract

This study evaluated the productive and reproductive performance of pure Holstein-Friesian (HF) and its fractional crosses with Red Sindhi (RS) at the Dairy Training and Research Institute (DTRI), U.P. at Los Banos, Laguna, using 554 records from 1962 to 1977.

The blood groups studied were :A - 50% HF x 50% RS, B - 75% HF x 25% RS, and D - 100% HF.

The means of lactation milk production (kg) of the cows of groups A,B,C and D, respectively, were : actual - 1646, 1858, 1882 and 1636; 305-day- 2195.0, 2169.9, 2038.9 and 1826.8; and FCM - 1902, 2013, 1998 and 1752. Differences between actual lactation means were insignificant. The means of 305-day production were statistically similar for A, B and C but means of A and B were higher (P/_ 0.05) than D. FCM means of A,B and C were statistically similar but were higher (P/_ 0.05) than D.

A highly significant (P/_0.01) correlation coefficient (r) of 0.65 was noted between 90-day total and total lactation milk yield. The calculated regression equation was: Y= 2.47X /165.81, where Y stands for predicted lactation production, and X, for 90-day total production. A highly significant (P/_0.01) r value of 0.74 was also noted between 90-day milk yield and FCM production. The calculated regression equation was: Y= 1.82X / 67.0, where Y stands for predicted FCM production, and X, for 90-day total production.

Means of age (months) and body weight (kg) at first calving were 32.4 and 350; 37.4 and 347; 37.4 and 361; and 35.5 and 376 for A,B,C and D, respectively, which were statistically not different.

Averages of services per conception were 1.90, 2.47, 2.44 and 2.25 times for A,B,C,D, respectively. Means of B, C, and D were statistically similar but A was better (P/_0.05) than B.

Averages of days open and days dry were: 150 and 146; 165 and 150: 176 and 178 and 184 and 180; for A,B,C and D, respectively, which were not statistically different. However, an increasing trend was noted as HF blood increased.

Blood groups A and B had higher percentages of calvings, as based on first calvings, than C and D.

FCM was highly (P/_0.01) correlated with body weight (r=0.14); lactation length (r=0.40);dry period (r=0.17); and number of services per conception (r=0.15). FCM was independent of number of days open (r=0). No significant correlation was noted with calving interval.

Fifty to 75%HF inheritance with RS appear to be the optimum limit. It is recommended that inter se matings may be experimented for possibly breed/grade development for the prevailing hot-humid conditions in the Philippines. For practicl purposes, it is suggested that the native cattle population be upgraded using HF or other exotic dairy breeds for rapid dairy development especially in the countryside.

Document Type

Dissertation

Degree

Doctor of Philosophy in Animal Science

College

Graduate School (GS)

Adviser/Committee Chair

Jeminiano R. Escano

Committee Member

Arturo C. Alferez, Arsenio D. Calub, Obdulia F. Sison

Language

English

LC Subject

Dairy cattle--Philippines--Los Baños, Laguna

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 1979 A5 A72

Notes

Doctor of Philosophy (Animal Science)

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