Search results for "milk production"

Milk production and physiological traits of ewes and goats housed indoor or grazing at different daily timing in summer

2009

During a 6 week trial in summer, 3 homogeneous groups, each consisting of 5 Comisana ewes and 5 Rossa Mediterranea goats, grazed watered forage resources during day (D) or night (N), or were housed indoor and supplied with mowed herbage (H). Maximum THI peaked at 94 at the end of July, and was almost constantly higher of 80. Milk yield was higher in N than in D and H goats, whereas N ewes produced more milk than H group, but their milk yield was higher than D ewes only in the period with the highest THI values. The lower urea in N goat milk, and the higher casein in N ewe milk, seem to indicate a better efficiency in dietary nitrogen utilization of night grazing animals. N ewes showed lower…

Effects of a GH polymorphism on milk production traits in Modicana and Cinisara cows reared in different feeding systems.

2019

Growth hormone, a polypeptide encoded by the GH gene, is a member of the somatotropin/prolactin family of hormones, which plays an important role on milk production and metabolism. In bovine, a single nucleotide polymorphism (SNP) in exon 5 changes leucine to valine (CTG to GTG) in the mature GH molecule. The purpose of this study was to evaluate, in Modicana and Cinisara cows, the effects of genetic polymorphism at GH locus and its interaction with feeding system on milk traits. A total of 97 individual Modicana blood samples were collected, 65 from a semi extensive and 32 from an extensive farm. A total of 58 Cinisara individual milk samples were collected, 32 from 7 extensive farms and 2…

Risk assessment of selection for restistant PrP alleles on milk production in Valle del Belice

2006

Comparison of Genome Wide Association Studies for milk production traits in Valle del Belice dairy sheep

The great achievements in livestock species selection during the last 50 years largely relied on quantitative genetic theory and infinitesimal genetic model. In the last 20 years, due to the application of advanced techniques in molecular genetics and statistics, several chromosomal regions that influence quantitative traits have been discovered. Combinations of molecular and classical quantitative information in a composite selection index have been proposed to increase the accuracy of selection. Nowadays, many genotyping arrays for thousands of SNPs are available for several livestock species, such as: cattle, sheep, pigs, horses, goat and chickens. The overall aim of this thesis is the c…

Contagious agalactiae: a prelimanr study on the impact on milk production of sicilian sheep

2014

Effects of grazing Trifolium subterraneum and Lolium multiflorum in various proportions on forage intake and milk production of dairy ewes

2011

The aim of this research was to evaluate the effects of grazing Trifolium subterraneum (T) and Lolium multiflorum (L), as pure or associated crops, on forage intake and milk yield and composition in Comisana ewes. The four following fenced subplots, each of 2500 m2, were used for grazing: T, 100% of surface; L, 100% of surface; TL, T and L on 66.6 and 33.3 % of surface; LT, T and L on 33.3 and 66.6% of surface, respectively. Each subplot was divided into two parcels in order to have two replicates. Forty ewes were divided into eight homogeneous groups, with regard to milk yield, days in milk and live weight. In spring for 70 days, each group grazed daily for 8 h one of the fenced parcels. M…

Effect of the inclusion of lemon citrus pulp in the diet of Valle del Belice lactating ewes. Milk production and composition.

2015

Lemon citrus pulp residues from the citrus juice industry; it belongs to the citrus by-product that are more extensively used for livestock feeding. Furthermore, citrus pulp is a source of flavonoids such as hesperidin and naringin, which have antioxidant properties. This study aimed to investigate the effect of fresh lemon citrus pulp (LP) as natural antioxidant, on feeding behavior, milk yield and milk quality of Valle del Belice lactating ewes in the hot summer season in Sicily. A total of 15 second lambing ewes were individually allocated in 3¥3 m box and fed with 3 diets in a 3 ¥ 3 Latin square design, with 3 phases composed of 21 days. The diets were: LP0, mixed hay ad libitum plus 60…

The effects of different milking intervals and milking times per day in jennet milk production

2012

Abstract In their first 150 days of lactation, nine Ragusana jennets were investigated at the ‘Istituto Sperimentale Zootecnico per la Sicilia’ (ISZS) in Palermo, to study the effects of different milking typologies on milk production. The jennets were kept in a paddock and were fed hay ad libitum and concentrate (3.5 kg jennet/day). From post-foaling day 21, every 3 weeks individual milk amounts were recorded, and individual milk samples were collected and analyzed for the main qualitative parameters. The compared theses were: two daily milking times with 6- and 3-h intervals; and two, three and eight daily milking times with 3-h interval. The jennets were manually milked. The foals were s…

Effects of αs1-casein and k- casein genotypes on nutrient intake and milk production in Girgentana goats: a further investigation

2013

The influence of polymorphism at αs1-casein locus (CSN1S1) on goat milk properties is adequately known, whereas the knowl- edge is limited on the effects of κ-casein gene variants (CSN3), C-093 and the association between variants of CSN1S1 and CSN3 Milking technique in jenny: effects on milk production genes. This study aimed to investigate the effect of some CSN1S1-CSN3 composite genotypes (CG) on feed intake and milk production of 95 Girgentana goats from 6 experiments (551 Rossella Di Palo, Diana Neri, Barbara Ariota, Rosanna Serafini, observations). Goats, genotyped using specific PCR protocols at DNA level and IEF technique at milk protein level, were equal at αs2-casein and β-casein …

VALUTAZIONE DEL LIVELLO DI RIEMPIMENTO DELLA MAMMELLA D’ASINA A DIVERSI INTERVALLI DI MUNGITURA

2013

Scopo del presente lavoro è stato quello di valutare il livello di riempimento della mammella d’asina a diversi intervalli di mungitura per definire il numero di mungiture giornaliere e il relativo intervallo che, nel rispetto della fisiologia della mammella dell’asina e del benessere animale, permettano di migliorare la produzione di latte. Durante lo studio differenti controlli batteriologici sono stati effettuati per verificare la qualità igienica del latte, considerando la principale destinazione del latte all’alimentazione dei lattanti affetti da Allergia alle Proteine del Latte Vaccino. Lo studio è stato condotto su 12 asine Ragusane pluripare in lattazione nel novembre 2011 presso l’…