Protocolo de manejo clínico e vigilância em casos de surto de streptococcus suis em leitões desmamados

Streptococcus suis (S. suis) is one of the major pathogens in pig farming, causing high economic losses, high mortality, weight loss of animals and high cost in treatments. This research aims to accompany the development of a monitoring system for young animals in a region that registers constant outbreaks of S. suis, allowing a detailed analysis of the spread of the disease, the identification of the age with the greatest involvement, as well as the rate of mortality within the flock. The study was carried out with a sample of 942 weaned piglets, with an average age of 24 days and an approximate weight of 5.06 kg. Monitoring of the animals was carried out, those with onset of symptoms suggestive of infection were medicated following an injectable drug protocol, with the clinical sign of choice for starting treatment was arthritis and/or motor incoordination. At the end of the experiment, total mortality was 204 piglets (21.65% of the batch), the highest mortality rate occurred in the 4th week after weaning, when the animals were in the 7th week of life.O Streptococcus suis (S. suis) é um dos maiores patógenos na suinocultura, ocasionando elevados prejuízos econômicos, alta mortalidade, perda de peso dos animais e o elevado custo nos tratamentos. Essa pesquisa tem como objetivo acompanhar o desenvolvimento de um sistema de monitoramento dos animais jovens em uma região que registra constantes surtos de S. suis, permitindo a análise detalhada da disseminação da doença, a identificação da idade com maior acometimento, bem como a taxa de mortalidade dentro do lote. O estudo foi desenvolvido com uma amostra de 942 leitões desmamados, com 24 dias de idade média e peso aproximado de 5,06Kg. Foi realizado o monitoramento dos animais, medicando conforme o protocolo injetável os leitões que apresentaram início de sinais clínicos sugestivos de infecção, sendo o de eleição para início do tratamento a artrite e/ou incoordenação motora. Ao termino do experimento, a mortalidade total foi de 204 leitões (21,65% do lote), maior taxa de mortalidade ocorreu na 4a semana pós desmame, na qual os animais se encontravam na 7a semana de vida

Impact of piglet birthweight and sow parity on mortality rates, growth performance, and carcass traits in pigs

ABSTRACT A total of 5502 piglets from 435 sows were selected for evaluation of the effect of piglet birthweight and sow parity on mortality rate (MR), growth performance, and carcass traits in pigs. Piglets were distributed into one of eight categories according to their weight (1801 g) and sows were classified according to parity (1-5). The maximum MR during lactation (day 0 to day 21) was found in category <600 g, whereas the lowest was observed in categories ≥1401 g. Pigs with greater body weight (BW) at birth were equivalently greater until 59 days of age. Average daily weight gain (ADG) was improved by increasing piglet birthweight between 0 and 21 days as indicated by a linear regression effect. After weaning, this effect was reduced up to 168 days, indicated by a quadratic, as opposed to linear, regression effect. The increase in growth rates corresponded to improved lean meat content and hot carcass weight. Increasing sow parity corresponded to a quadratic improvement of BW and ADG during lactation, but not after weaning. However, the improved pre-weaning performance was concomitant with a linear increase of within-litter BW and ADG variation. No effect of parity was observed on carcass traits. Piglet birthweight and sow parity influence litter postnatal development, mainly during early life. After weaning, these effects are less evident with a minor impact on carcass traits

Impact of piglet birthweight and sow parity on mortality rates, growth performance, and carcass traits in pigs

<div><p>ABSTRACT A total of 5502 piglets from 435 sows were selected for evaluation of the effect of piglet birthweight and sow parity on mortality rate (MR), growth performance, and carcass traits in pigs. Piglets were distributed into one of eight categories according to their weight (<600, 601-800, 801-1000, 1001-1200, 1201-1400, 1401-1600, 1601-1800, and >1801 g) and sows were classified according to parity (1-5). The maximum MR during lactation (day 0 to day 21) was found in category <600 g, whereas the lowest was observed in categories ≥1401 g. Pigs with greater body weight (BW) at birth were equivalently greater until 59 days of age. Average daily weight gain (ADG) was improved by increasing piglet birthweight between 0 and 21 days as indicated by a linear regression effect. After weaning, this effect was reduced up to 168 days, indicated by a quadratic, as opposed to linear, regression effect. The increase in growth rates corresponded to improved lean meat content and hot carcass weight. Increasing sow parity corresponded to a quadratic improvement of BW and ADG during lactation, but not after weaning. However, the improved pre-weaning performance was concomitant with a linear increase of within-litter BW and ADG variation. No effect of parity was observed on carcass traits. Piglet birthweight and sow parity influence litter postnatal development, mainly during early life. After weaning, these effects are less evident with a minor impact on carcass traits.</p></div