Article (Scientific journals)
Study on reproductive performance of Holstein x Lai Sind crossbred heifers and cows at smallholdings in Ho Chi Minh City, Vietnam.
Nguyen-Kien, Cuong; Nguyen, Van Khanh; Hanzen, Christian
2017In Tropical Animal Health and Production, 49, p. 483-489
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Keywords :
Holstein x Lai Sind crossbred; reproductive performance; smallholdings Vietnam
Abstract :
[en] The reproductive performance of Holstein x Lai Sind crossbred dairy heifers and cows was evaluated at small-holdings in Ho Chi Minh City (HCMC). The data of 232 heifers and 244 cows (261 lactations) from 35 small dairy farms was collected over a 2-year period, from 2013 to 2014. The overall mean for age at first service (AFS), days between first and last service (DFLS), and age at conception (AC) of heifers was 479 (±80), 38 (±80), and 517 (±114) days, respectively. Average number of services per conception (NSC), conception rate (CR), and conception rate at first ser-vice (CRFS) was 1.8 (±1.4), 55, and 58%, respectively. The overall mean for the waiting period (WP), DFLS, and days open (DO) of cows was 109 (±52), 133 (±114), and 242 (±129) days, respectively. The mean for NSC, CR, and CRFS was 4.3 (±2.7), 23, and 14%, respectively. A very sig- nificant decrease in AFS and AC according to the year of birth, and a significant increase in AFS according to body weight at first insemination (>320 kg) were observed. The CRFS of heifers inseminated in 2013 was significantly higher than in 2014. Monthly mean CR in heifers and cows was negatively correlated with THI. The WP, DFLS, DO, and NSC of cows significantly decreased according to the year of calving. Cows that calved in rainy season had a significant-ly longer WP than in dry season. The occurrence of postpar-tum (PP) diseases was accompanied by an increase in WP, DO, and NSC. A decrease in body condition score (BCS) between calving and 60th day (C60) and also between 60th and 120th day of lactation resulted in a significant increase in WP and DO. A decrease in BCS between C60 was also ac-companied by a considerable reduction in CRFS of cows. Season and BCS at insemination had a significant effect on NSC and CR of cows. Reproductive performance was satis-factory for heifers, but poor for cows. Losses of BCS during the first months of lactation and at insemination were the major risk factors for this poor performance. Moreover, the season had a more negative effect on fertility in cows than in heifers.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Nguyen-Kien, Cuong
Nguyen, Van Khanh
Hanzen, Christian  ;  Université de Liège > Département clinique des animaux de production (DCP) > Thériogenologie des animaux de production
Language :
English
Title :
Study on reproductive performance of Holstein x Lai Sind crossbred heifers and cows at smallholdings in Ho Chi Minh City, Vietnam.
Alternative titles :
[fr] Etude des perforamances de reproduction des génisses et vaches laitières croisées Holstein x Lai Sind des petits élevages de Ho Chi Minh City au Vietnam.
Publication date :
15 January 2017
Journal title :
Tropical Animal Health and Production
ISSN :
0049-4747
eISSN :
1573-7438
Publisher :
Kluwer Academic Publishers, Boston, United States - Massachusetts
Volume :
49
Pages :
483-489
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
CTB - Coopération Technique Belge [BE]
Available on ORBi :
since 26 February 2017

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