PMID- 28058575
OWN - NLM
STAT- MEDLINE
DCOM- 20170601
LR  - 20181202
IS  - 1573-7438 (Electronic)
IS  - 0049-4747 (Linking)
VI  - 49
IP  - 3
DP  - 2017 Mar
TI  - Study on reproductive performance of Holstein x Lai Sind crossbred dairy heifers 
      and cows at smallholdings in Ho Chi Minh City, Vietnam.
PG  - 483-489
LID - 10.1007/s11250-016-1217-0 [doi]
AB  - The reproductive performance of Holstein x Lai Sind crossbred dairy heifers and 
      cows was evaluated at smallholdings 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 service (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 
      significant 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 significantly longer WP than in dry season. The occurrence of postpartum (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 accompanied 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 satisfactory 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.
FAU - Nguyen-Kien, Cuong
AU  - Nguyen-Kien C
AD  - Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Ho Chi 
      Minh City, Vietnam.
AD  - Faculty of Veterinary Medicine, Department of Large Animal Theriogenology, 
      University of Liege, Liege, Belgium.
FAU - Van Khanh, Nguyen
AU  - Van Khanh N
AD  - Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Ho Chi 
      Minh City, Vietnam.
FAU - Hanzen, Christian
AU  - Hanzen C
AD  - Faculty of Veterinary Medicine, Department of Large Animal Theriogenology, 
      University of Liege, Liege, Belgium. christian.hanzen@ulg.ac.be.
LA  - eng
PT  - Journal Article
DEP - 20170105
PL  - United States
TA  - Trop Anim Health Prod
JT  - Tropical animal health and production
JID - 1277355
SB  - IM
MH  - Animals
MH  - Body Weight
MH  - Cattle/*physiology
MH  - Dairying/*statistics & numerical data
MH  - Female
MH  - Fertility
MH  - Fertilization
MH  - Lactation
MH  - Parturition
MH  - Pregnancy
MH  - Puerperal Disorders/veterinary
MH  - *Reproduction
MH  - Seasons
MH  - Tropical Climate
MH  - Vietnam
OTO - NOTNLM
OT  - Holstein x Lai Sind crossbred
OT  - Reproductive performance
OT  - Risk factors
OT  - Smallholdings
OT  - Vietnam
EDAT- 2017/01/07 06:00
MHDA- 2017/06/02 06:00
CRDT- 2017/01/07 06:00
PHST- 2016/06/08 00:00 [received]
PHST- 2016/12/27 00:00 [accepted]
PHST- 2017/01/07 06:00 [pubmed]
PHST- 2017/06/02 06:00 [medline]
PHST- 2017/01/07 06:00 [entrez]
AID - 10.1007/s11250-016-1217-0 [pii]
AID - 10.1007/s11250-016-1217-0 [doi]
PST - ppublish
SO  - Trop Anim Health Prod. 2017 Mar;49(3):483-489. doi: 10.1007/s11250-016-1217-0. 
      Epub 2017 Jan 5.