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• Oestrus Inductionin Cows in Ba Vi District Using Viet Nam’s Progesterone Release (ProB)

  Giang Hoang Ha, Pham Van Gioi, Su Thanh Long

  Date Received: 06-07-2018 / Date Accepted: 08-09-2018

   Abstract PDF (VIETNAMESE)

  The study was performed to evulate the efficacy of “made-in Vietnam” progesterone releasing device in regulating the reproductive cycle of dairy herd in Bavi district, Hanoi, from February 2017 to November 2017. That applying of Ovsynch plus intravaginal device (ProB in the experimental group; CIDR® in the control group) resulted in high rate of estrus expression in both groups; especially during the period of 2-3 days post-treatment. In addition, the estrus rate according to BCS and parity of the cows was also assessed, which revealed that the cows with lower parity were more active with the protocol than those with higher parity (above 3th parity). It is also noted that the distribution of oestrus cows mainly concentrated on the BCS ranging from 2.75 to 3.0. With the feasible results of determinating the vaginal irritation as an effect of the devices, the authors tentatively recommended introducing ProB to dairy cows across the country.

• Reproductive Performance of Landrace and Yorkshire Sows from French Genetic Resource in Three Different Generations at Thuy Phuong Pig Research and Development Center

  Nguyen Thi Hong Nhung, Pham Duy Pham, Trinh Hong Son, Pham Doan Lan, Do Duc Luc

  Date Received: 30-07-2020 / Date Accepted: 19-08-2020

   Abstract PDF (VIETNAMESE)

  This study was conducted at Ky Son pigs research station of Thuy Phuong Pig Research and Development Center - National Institute of Animal Science from 2015 to 2020 to evaluate the effects of breed (Landrace and Yorkshire), generation (initial, 1 and 2), season (spring, summer, autumn and winter) and parity (1, 2, 3, 4, 5 and 6) on reproductive performance of Landrace (L) and Yorkshire (Y) sows. The reproductive traits were collected from 320 sows (160 L and 160 Y) with 1549 litter (781 L and 768 Y) of 6 parities, including 80 sows (40 L and 40 Y) of the initial generation imported from France, 120 sows (60 L and 60 Y) of the first and 120 sows (60 L and 60 Y) of the second generation. The results show that breed, generation and parity affected the number born alive, number of weaned pigs, litter weight at birth and litter weight at weaning (P <0.0001); however, the season did not affect these traits (P >0.2839). The reproductive performance of Y sows was higher than that of L for litter sizes and litter weights at birth and weaning (P <0.0001). Sows from French genetic resource had a high reproductive performance: number born alive (12.82 and 13.59 piglets), number of weaned pigs (11.37 and 12.01 piglets), litter weight at birth (19.62 and 20.39 kg), litter weight at weaning (74.43 and 79.06 kg, respectively for L and Y) and increased over generations (P <0.0051). Landrace and Yorkhire pigs from French genetic resources can be used to multiply a purebred nucleus and create F1 sows from two breeds in Northern Vietnam.

• Factors Associated with Duration of Postpartum Vaginal Discharge in Sows

  Nguyen Hoai Nam, Nguyen Van Thanh

  Date Received: 06-07-2017 / Date Accepted: 06-11-2017 / Date Published: 06-08-2025

   Abstract PDF (VIETNAMESE)

  Prolonged postpartum vaginal discharge is believed to harmfully affect reproductive performance of sows. The present study investigated the factors affecting the duration of postpartum vaginal discharge in sows. Data were collected from 530 sows raised at 5 farms in 3 provinces, i.e, Hai Duong, Bac Ninh and Thai Nguyen. One way ANOVA tests were used to assess effects of parity and postpartum body temperature on the duration of postpartum vaginal discharge while student t-tests were employed to assess effects of assisted farrowing, stillbirth, accumulated duration of farrowing and of placental expulsion and presence of wound(s) on the duration of postpartum vaginal discharge. Results showed that incidence of wound, assisted farrowing and stillbirth was 13.47%, 35.20% and 39.35%, respectively. The accumulated duration of farrowing and of placental expulsion was 6.70 ± 2.95 h while the duration of postpartum vaginal discharge was 4.31 ± 1.08 days. The postpartum body temperature was 39.40 ± 0.450C. Assisted farrowing, stillbirth, accumulated duration of farrowing and of placental expulsion ≥ 5 h, parity > 5 and postpartum body temperature ≥ 39oC increased the duration of postpartum vaginal discharge. This study indicated that several factors affected the duration of postpartum vaginal discharge, therefore, there is a need to find out approach(es) to mininize the detrimental effects of those factors, and to consequently improve the reproductive performance of  sows.

  DOI: https://doi.org/10.31817/tckhnnvn.2017.15.10.

• Effects of Season, Calving Parity and Body Score on Ovary Activities of 120-Day Post-Calving Dairy Cows Reared at Ba Vi, Ha Noi

  Su Thanh Long, Tang Xuan Luu, Tran Thi Loan, Nguyen Huu Cuong, CuXuan Dan, Tran Tien Dung, Nguyen Thi Thoa

  Date Received: 20-06-2014 / Date Accepted: 13-08-2014 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  At present, Vietnam`s dairy industry is developing but faceswith severalreproduction disorder problemsincluding persistent corpus luteum, cysticovaryorinactive ovary. An experiment was carried out from Apr. 2011 to Apr. 2014 to study the effects of season, calving parity and body score on ovary activities of 120-day post-calving dairy cows reared at Bavi, Hanoi. Clinical examination of 746 cows showed that, 16.75%of them hadno estrous signsuntil 120-daypost-calvingowing to ovarianproblems. The percentages of ovarian disorderin Spring and Summer were higher than that in Autumn and Winter and also increased following the calving parities. In addition, the pathological symptoms of ovaries of the cows were affected by the body score, i.e., too fat or too thin cows.

  DOI: https://doi.org/10.31817/tckhnnvn.2014.12.5.