Natália Albieri Koritiaki

Fatores que afetam o desempenho de cordeiros Santa Inês puros e cruzados do nascimento ao desmame

The objective of this study was to evaluate the environmental effects (age of dam, type of birth, sex of the lamb and year of birth) and genetic groups on the weight and morphometric measurements of lamb at birth and at weaning; test regressions for predicting weight of lambs by the measurements and describe the type of growth of the measures. Lambs of young ewes (2 teeth) had lower average for all characteristics except height at weaning. The average birth weight ranged from 3.34 ± 0.14kg in the offspring of two teeth ewes to 3.94 ± 0.09kg in the lambs of eight teeth ewes, and for weaning weight ranged from 12.19 ± 0.72kg in the offspring of two teeth ewes, and 14.79 ± 0.62 in the lambs of six teeth ewes. The single birth lambs had highter averages than the twins. Means for birth weight ranged from 3.24 ± 0.11kg to 4.08 ± 0.06kg and for weaning weight from 11.18 ± 0.59kg to 15.81 ± 0.35kg, the averages were lower for twins and greater for single lambs. The genetic group affected the weight and the length and height at birth, where purebred Santa Ines lambs presented greater averages than ½ Santa Ines lambs. The year of birth influenced all traits. All correlations between weights and measures were significant. It is possible to predict the weight on the basis of measures.

Influence of pre and postnatal energy restriction on the productive performance of ewes and lambs

The objective of this study was to evaluate the influence of feeding energy levels during the last third of gestation and lactation on performance of ewes and lambs up to weaning. The experiment was carried out in the sheep raising sector of Universidade Estadual de Londrina (UEL), from August to December of 2007. Thirty-two adult lambs with 105 days of gestation, average live weight of 57.55 kg and average body condition scores of 3.42 were used in the beginning of the experiment. The animals were confined in collective pens, distributed randomly in three treatments: 2.4; 2.2 and 2.0 Mcal of metabolizable energy (ME)/kg of dry matter (DM). Feed supply was ad libitum during the last third of gestation and lactation. Weaning occurred at 70 days. Body weight, body condition score and milk production of ewes and body weight of the lambs were analyzed. There were no significant differences for body weight and body condition of ewes at lambing; however, the level of 2.4 Mcal enabled better results for those characteristics at weaning and higher gain in weight and body condition scoring during the experiment. Severe energetic restriction (2.0 Mcal ME/kg DM) determined lower average daily milk production. Lambs from levels 2.4 and 2.2 presented similar weights in all measurements and were superior to those in level 2.0. Lambs from level 2.4 presented higher average weight gain from birth to weaning. The energetic restriction upon lambs at the end of gestation and during lactation limits the performance of ewes and lambs up to weaning.

Desempenho, consumo e morfometria in vivo de cordeiros Santa Inês alimentados com rações contendo torta de girassol em substituição ao farelo de algodão

This study was conducted with the aim to determine the optimal level of protein replacement of cottonseed meal protein by sunflower cake in diets for Santa Ines lambs, through the evaluation of consumption, weight gain, feed conversion and morphometric measurements. Thirty Santa Ines lambs, bulls, with age and weight at the beginning of the experiment of 80 days and 21.45±2.16kg, respectively, were confined for 60 days. A completely randomized experimental design was used, where the animals were divided into 5 treatments with 6 replicates per treatment. For the treatments, the protein from the cottonseed meal was replaced by the protein of the sunflower cake (0, 20, 40, 60 and 80% of substitutions). For morphometric determinations, the following measurements were taken: pre-slaughter body length, leg length, leg perimeter, height of the dorsum; hip height; chest girth, hip width and chest width. Final weight, dry matter intake and feed conversion were not affected by the experimental diets, although the average daily gain was lower for diets with higher content of sunflower cake. For consumption parameters, there was a difference only in the consumption of ether extract in relation to metabolic weight (g/kg PV 0, 75), where lambs receiving diets with higher levels of sunflower cake ingested larger amounts of ether extract. Regarding the morphometric measurements, there was a linear decrease of the height of the dorsum and hip width with the inclusion of sunflower cake in the diet. The replacement of cottonseed meal protein by sunflower cake protein negatively affected the weight gain of Santa Ines lambs. However, it affected little or nothing the parameters of consumption and in vivo morphometric measurements.

Influence of environmental factors on ponderal performance and morphometric characteristics of lambs of different genetic groups from birth to weaning

The objectives of this work were to evaluate the environmental effects (age of dam, type of birth and sex of lamb) and genetic groups (Hampshire Down and Ile de France, ½ and ¾ Hampshire Down, Ile de France and Suffolk, and ½ Texel) on performance and morphometric characteristics (height, length and heart girth) of lambs; to test regressions to predict live weight of lambs from body measurements; and to describe the growth type of the measurements as function of the weight. Weights and measurements were collected from birth to weaning, every 14 days. For evaluations of performance in relation to environmental effects and genetic groups, only data from birth and from weaning were used; for type of growth all collected data were used. Lambs from younger ewes (2 teeth) presented smaller average for weight at birth, heart girth and height at weaning. Single-birth lambs presented greater averages than twins. Genetic group influenced all traits evaluated, except heart girth at birth and average heart girth gain. Means for birth weight were higher in ¾ Ile de France (3.93±0.16 kg) and lower in ½ Texel lambs (3.04±0.24 kg), and for weaning, they were higher in ½ Texel (14.86±0.87 kg) and lower in Ile de France lambs (11.66±0.83 kg). Year of birth influenced all traits. Heart girth and length showed a negative allometric growth in relation to weight, while between weight and height the relation was positive allometric. The factors that most influenced the performance of lambs from birth to weaning are the type of birth, genetic group and year of birth. Correlations between body weight and morphometric measurements are significant, so it is possible to predict one from the other.

Effect of environmental factors on performance of purebred and crossbred Santa Inês lambs from birth to 154 days of age

The objectives of this study were to evaluate the environmental effects (age of dam at lambing, type of birth and sex of lamb) and genetic groups (Santa Ines and ½ Santa Ines) on weight and morphometric measurements (heart girth, body length and height) of lambs; to test linear and allometric regressions to predict the weight through the measurements; and to describe the type of growth of the measurements from weight. Weight and morphometric measurements were sampled from birth to 154 days of age, at every 14 days. For the evaluation of the environmental factors and to predict the regressions the data of birth, weaning and 154 days of age were used; and to determine the type of growth all the data collected were used. The lambs derived from younger (two-tooth) ewes recorded lower averages than the ones from eight-tooth ewes for weight, heart girth and body length at birth and length at weaning. The animals born from single births presented higher average weight from birth to weaning, as well as of all the measurements from birth to 154 days of age than those from twin births. There was no difference between the genetic groups Santa Ines and ½ Santa Ines. The correlations between the weight and measurements were significant, and it was possible to predict the weight from the morphometric measurements through regressions. The type of weight gain with heart girth was isometric, while with length it was positive allometric, and with height it was negative allometric. Thereby, in the absence of a scale it is possible to predict the weight from the morphometric measurements, and the type of birth is the most important factor that affects the development of lambs from birth to weaning.

Comportamento de consumidores de carne de cordeiro na região norte do Paraná

For many years the marketing of sheep meat was disorganized, with slaughter of low quality animals. This has created an image unfavorable to the product. As this scenario changes, sheep meat is more prominent, especially lamb meat that serves market niches in large urban centers. The objective of this work was to measure the consumption and acceptability of sheep meat in the region of Londrina PR, according to the gender, age, level of schooling and family income of the persons interviewed, as well as to evaluate the sensorial parameters of sheep meat according to consumers without the information of the animal species, aiming to indicate guiding actions for the productive chain of sheep. A total of 951 inhabitants were interviewed and a consumer study was conducted with 134 inhabitants, both from Londrina and region, during the Agricultural and Industrial Exhibition of Londrina, in the year 2014. The main reasons for not consuming the meat is the lack of custom 44.1% followed by the fact of not liking 39.8%. Constantino et al. 2 PUBVET v.12, n.1, a19, p.1-7, Jan., 2018 The reason they do not like meat is the strong smell of the animal 44.8% followed by the sweet taste 20.2%. Regarding the acceptability of the sample, 47.01% of the consumers marked the meat as much as they liked, followed by 26.87% that tasted extremely, only 2.25% of consumers marked the meat as unpleasant. It is observed that the great barrier to increase the consumption of the sheep meat is the lack of custom and bad experiences that lead to the non consumption.

Desempenho, qualidade da carcaça e carne de ovinos de descarte de diferentes idades e gêneros

Several authors commented that the inadequate quality of sheep meat is due to the low quality of the meat of discarded animals, like adult animals. The carcasses are excess fat; the meat color is darker, meat firmer, and has a more pronounced taste and aroma. The objective of this work was to measure the performance, carcass quality and meat of sheep of different categories. Twenty five animals, 5 lambs, 5 lambs, 5 whole males, 5 castrated males and 5 sheep were used. After a period of 50 days of daily grazing and supplementation at night the animals were slaughtered. Measurements were made on the carcass and meat of the animals. Data were submitted to analysis of variance and Tukey test at 5%. Regarding performance, biometrics and carcass evaluations, castrated males, whole males and sheep presented the highest values, but it is interesting to note that lambs and lambs presented satisfactory results. Another important point is that the true yield, shear force and overall acceptability of the sample in the sensory analysis were similar across all categories. Regarding the size of cuts what should be taken into account is what the consumer market expects, consuming large or small cuts. As for the quality of the meat, Constantino et al. 2 PUBVET v.12, n.2, a34, p.1-9, Fev., 2018 adult animals presented more fat, which may be interesting to guarantee a better carcass and sensorial quality of the meat, as long as it is not an excess that increases the losses in the carcass toilet or worse the odor of the meat.