Characterization of Lactation Patterns and Milk Yield in a Multibreed Dairy Cattle Population in the Central Thailand

Name: Ameena Seangjun

Organization : Kasetsart University. Faculty of Agriculture. Department of Animal Science

Name: Skorn Koonawootrittriron

Organization : Kasetsart University. Faculty of Agriculture. Department of Animal Science

Name: Mauricio A. Elzo

Organization : University of Florida. Department of Animal Sciences,

keyword: dairy

; multibreed

; tropic

; lactation pattern

; milk

; genetic

Abstract: Patterns for five 5 lactation traits: initial yield (IY), peak yield (PY), days to peak (DTP), persistency (PST) and 305-d milk yield (MY) were studied in a multibreed population in Central Thailand using first-lactation, monthly test-day records collected on 108 farms from 1998 to 2006. Breed groups were BG1 (purebred H), BG2 (0.9687 ≤ H < 1.00), BG3 (0.9375 ≤ H < 0.9687), BG4 (0.875 ≤ H < 0.9375) and BG5 (0.50 ≤ H < 0.875). The model for each trait included the fixed effects of herd-yearseason, calving age and breed group. Random effects were cow and residual. Covariance components were estimated using an average information restricted maximum likelihood procedure, and were subsequently used to calculate the heritabilities and genetic correlations. Least square means ranged from 14.16 ± 0.71 kg (BG5) to 16.04 ± 0.66 kg (BG4) for IY, 18.23 ± 0.55 kg (BG5) to 19.84 ± 0.51 kg (BG4) for PY, 36.51 ± 3.78 d (BG4) to 52.04 ± 9.74 d (BG1) for DTP, 6.45 ±0.24 (BG1) to 6.71 ± 0.11 (BG3) for PST, and 4,083.74 ± 103.50 kg (BG5) to 4,317.15 ± 111.56 kg (BG3) for MY. Breed group differences were non-significant. Heritability estimates were 0.23 ± 0.18 for IY, 0.20 ± 0.18 for PY, 0.52 ± 0.28 for DTP, 0.21 ± 0.19 for PST, and 0.43 ± 0.24 for MY. Genetic correlations between MY and IY, PY, DTP and PST were 0.40 ± 0.45, 0.62 ± 0.30, 0.36 ± 0.33, and 0.56 ± 0.39, respectively. These results suggested that PY and PST could be improved resulting in higher MY under the environmental conditions of Central Thailand.

Kasetsart University. Office of the University Library

Address: BANGKOK

Email: tdckulib@ku.ac.th

Created: ม.ค.-มี.ค. 2552

Modified: 2009-08-15

Issued: 2009-08-15

บทความ/Article

application/pdf

วิทยาสารเกษตรศาสตร์ (วิทยาศาสตร์), 43(1) หน้า 74-82

eng

Spatial: Central Thailand

©copyrights Kasetsart University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	A0902161406048258.pdf	170.48 KB	23	2026-05-26 18:16:01

ใช้เวลา

0.042749 วินาที