Behaviour and growth performance of low-birth-weight piglets cross-fostered in multiparous sows with piglets of higher birth weights / Comportamento e desempenho de crescimento de leitões com baixo peso ao nascer uniformizados com leitões de maior peso em fêmeas suínas multíparas

The aim of the study was to evaluate the behaviour, pre-weaning survival rate and growth performance of low birth weight (BW) piglets cross-fostered with piglets of higher weights. Piglets were transferred to 60 foster sows, and divided in three groups (G; n=20): G1- 12 low BW piglets (0.80 - 1.25kg); G2- six low BW piglets and six intermediate BW piglets (1.40 - 1.60kg), and G3- six low BW piglets and six high BW piglets (>1.70kg). For the analysis, groups G2 and G3 were subdivided in LG2 (six G2 light piglets); IG2 (six G2 intermediate piglets), LG3 (six G3 light piglets), and HG3 (six G3 heavy piglets). Behavioural observations were carried out on days 1, 2, 4 and 6 (visual direct observation) and on days 3 and 5 (video recording) after birth. The percentage of missed nursings was higher in LG3 piglets than in LG1, IG2 and HG3 piglets, on days 1 and 2. On day 4, light piglets (LG1, LG2 and LG3) missed more nursings than IG2 and HG3 piglets. On day 3, video recording showed a higher percentage of missed nursings in LG1, LG2, and LG3 piglets as compared to HG3 piglets. On day 1, the number of fights during nursing was higher in IG2 than in LG1 and LG3 piglets. Also on day 1, number of fights and percentage of piglets engaged in fights, during 15min after nursing, were higher in LG1, LG3 and HG3 than in LG2 piglets. More playful behaviours were observed on day 2 in IG2 and HG3 piglets compared to LG1, LG2 and LG3 piglets. Light piglets (LG1, LG2, and LG3) presented similar body weight on days 4, 8, 12 and 16 after birth, regardless of being mixed with piglets of higher weights or not; however, the survival rate until day 16 was most compromised in LG3 piglets compared to the other groups. Despite the lack of influence of littermates' weight on the growth of low BW piglets, their survival rate indicates that they should not be mixed with high BW piglets.(AU)

O objetivo do estudo foi avaliar o comportamento, a taxa de sobrevivência pré-desmame e o desempenho de crescimento de leitões leves ao nascer uniformizados com leitões de maior peso ao nascer (PN). Os leitões foram transferidos para 60 fêmeas e divididos em três grupos (G; n=20): G1 - 12 leitões de baixo PN (0,80-1,25kg); G2 - seis leitões de baixo PN e seis com PN intermediário (1,40-1,60kg); e G3 - seis leitões de baixo PN e seis leitões pesados (>1,70kg). Para a análise, os grupos G2 e G3 foram subdivididos em LG2 (seis G2 leitões leves); IG2 (seis G2 leitões de peso intermediário); LG3 (seis G3 leitões leves) e HG3 (seis G3 leitões pesados). Observações de comportamento foram realizadas nos dias 1, 2, 4 e 6 (observações visuais diretas) e nos dias 3 e 5 (gravações) após o nascimento. A porcentagem de mamadas perdidas foi maior no grupo LG3 quando comparado aos grupos LG1, IG2 e HG3, nos dias 1 e 2. No dia 4, leitões leves (LG1, LG2 e LG3) perderam maior número de mamadas do que os grupos IG2 e HG3. No dia 3, a gravação mostrou maior porcentagem de perda de mamadas nos grupos LG1, LG2 e LG3 do que no grupo HG3. No dia 1, o número de brigas durante a mamada foi maior nos grupos IG2 do que nos grupos LG1 e LG3. Também no dia 1, o número de brigas e porcentagem de leitões envolvidos em brigas, durante 15 minutos após a mamada, foi maior nos grupos LG1, LG3 e HG3 do que no grupo LG2. Brincadeiras foram mais observadas no dia 2 nos grupos IG2 e HG3 quando comparado aos grupos LG1, LG2 e LG3. Leitões leves (LG1, LG2 e LG3) apresentaram peso semelhante nos dias 4, 8, 12 e 16 após o nascimento, independentemente de serem misturados ou não com leitões pesados. No entanto, a taxa de sobrevivência até o dia 16 foi mais comprometida nos leitões do grupo LG3 do que nos outros grupos. Apesar da falta de influência do peso das leitegadas no crescimento de leitões de baixo PN, a taxa de sobrevivência indicou que estes não devem ser misturados com leitões de maior PN.(AU)

Induction and synchronization of ovulation in sows using a Gonadotropin-releasing Hormone Analog (Lecirelin)

The GnRH agonist, Lecirelin (Gestran Plus®; ARSA S.R.L., Buenos Aires, Argentina), was tested for the ability to induce and synchronize ovulation in sows. Sows were uniformly allocated in two groups (n = 56, each) according to parity (2-6), weaning to estrus interval (WEI) and body condition score (BCS). The GnRH analog (25 µg, 1 ml) and saline solution (control group) were injected at estrus onset. Estrus detection and transcutaneous real-time ultrasonography were performed every 8 h. Duration of estrus for the control and treated groups was 66.3 ± 1.3 h and 61.3 ± 1.3 h (P < 0.007), respectively. Interval from estrus onset to ovulation (IEO) was 44.3 ± 1.2 h and 39.9 ± 1.2 h (P < 0.012) for the control and treated groups, respectively. Up to 40 h after treatment administration, 70.9% of Lecirelin sows had ovulated whereas 48.2% of control sows ovulated in the same period (P < 0.01). There was a tendency for a greater proportion of Lecirelin sows (92.7%) to ovulate during the 48-h period post treatment compared to control sows (82.4%). Reproductive performance (farrowing rate, number of total piglets born, piglets born alive, stillborn piglets and mummified fetuses) was not affected (P > 0.05) by induction of ovulation with Lecirelin. Based on the results found, it can be concluded that Lecirelin injection at estrus onset reduces estrus length and interval between estrus onset and ovulation with no influence on the subsequent reproductive performance.(AU)}

Induction and synchronization of ovulation in sows using a Gonadotropin-releasing Hormone Analog (Lecirelin)

The GnRH agonist, Lecirelin (Gestran Plus®; ARSA S.R.L., Buenos Aires, Argentina), was tested for the ability to induce and synchronize ovulation in sows. Sows were uniformly allocated in two groups (n = 56, each) according to parity (2-6), weaning to estrus interval (WEI) and body condition score (BCS). The GnRH analog (25 µg, 1 ml) and saline solution (control group) were injected at estrus onset. Estrus detection and transcutaneous real-time ultrasonography were performed every 8 h. Duration of estrus for the control and treated groups was 66.3 ± 1.3 h and 61.3 ± 1.3 h (P 0.05) by induction of ovulation with Lecirelin. Based on the results found, it can be concluded that Lecirelin injection at estrus onset reduces estrus length and interval between estrus onset and ovulation with no influence on the subsequent reproductive performance.