Murat Görgülü

Nutritional consequences among ingredients of free-choice feeding Awassi lambs

Abstract The present study was designed (1) to test whether growing lambs can select an adequate diet when offered an unrestricted choice among feed ingredients, and (2) to determine whether choice feeding compared with single-feeding would alter the fattening performance of lambs reared under normal husbandry conditions. Thirty, 3-month-old male Awassi lambs were used. Each dietary treatment had three replicate groups, comprising five lambs each. Ground barley, wheat bran, cottonseed meal and alfalfa hay were used as the main feed ingredients. One of the dietary treatments (choice-fed) was offering the main feed ingredients as choices, while the other (single-fed) was feeding with a control diet (containing 2.4 Mcal ME kg−1 and 17.0% CP) prepared using the same feed ingredients for a 56 day fattening period. Lambs offered choices among the feed ingredients could select diets to meet their nutrient requirements according to age throughout the fattening period. For the entire experimental period the choice-fed group attained higher daily live-weight gain (346 g vs. 299 g; P 0.05) between daily feed intake of the choice-fed and single-fed groups (1776 g vs. 1704 g) was observed. The lambs consistently selected diets high in CP relative to ME when allowed to choose feed ingredients. It is concluded that lambs, when given choices among feed ingredients (ground barley, cotton seed meal, wheat bran and alfalfa straw), can select diets that meet their nutrient requirements according to stage of maturity and they attain better growth performance than lambs fed with a single diet.

Effects of Dietary Yucca schidigera Powder on Performance and Egg Cholesterol Content of Laying Hens

Abstract Kutlu, H.R., Görgülü, M. and Ünsal, I. 2001 Effects of dietary Yucca schidigera powder on performance and egg cholesterol content of laying hens. J. Appl. Anim. Res., 20: 49–56. The present study was carried out to determine whether dietary Yucca schidigera powder would affect egg yolk cholesterol content and laying performance of chickens. Sixty, 28-week-old White Hyline layers were divided into four dietary treatment groups of similar mean weight, comprising 15 birds each. A standard layer feed as the basal diet of the trial was supplemented with 0, 30, 60 or l20 ppm Yucca schidigera powder. Yucca supplementation to the diet did not affect feed intake, egg production, feed conversion efficiency, body weight gain, egg shell, white and yolk weights, shell thickness and shape index but reduced number of cracked eggs (P<0.05). Yucca supplementation also reduced yolk cholesterol content in a dose related (P<0.05) and a time dependent (P<0.01) manner.

Effect of somatic cell count on milk yield and composition of first and second lactation dairy cows

This study was carried out to investigate the effect of somatic cell count (SCC) on milk yield and milk composition in first and second lactation Holstein dairy cows. Thirty cows in first lactation and 49 cows in second lactation were used in the study. Animals were 15±9.87 days in milk. Individual milk samples were collected monthly from June 2009 to March 2010, and somatic cell counts, milk protein, milk fat, lactose and milk urea-N were determined. Four SCC groups were formed for determining effect of SCC on milk yield and composition. These groups were as follows: ≤200, 201-500, 501-999, and ≥1.000×103 cell/mL. It was observed that SCC had a high significant effect on milk yield, milk protein, milk lactose (P<0.01), total solids and milk urea-N (P<0.05), however, the effect of SCC on milk fat was not significant (P>0.05). This study indicates that high SCC negatively affects not only milk yield but also milk composition and quality.

Effect of Dietary Supplemental Yucca schidigera Powder on Fattening Performance of Male Lambs

Abstract Görgülü, M., Yurtseven, S., Ünsal, İ. and Kutlu, H.R. 2004. Effect of dietary supplemental Yucca schidigera powder on fattening performance of male lambs. J. Appl. Anim. Res., 25: 33–36. To determine the effect of Yucca schidigera powder on fattening performance of growing male lambs in two consecutive experiments, 30 lambs (Assaf, in the first experiment, Ile de France x Awassi crossbred in the second experiment), weaned at 70–80 days, were equally divided in two groups with three replicates each. Lambs in both the groups were fed isocaloric and isonitrogenic diets and the diet in treatment group was supplemented with 150 ppm Yucca schidigera. The diets had 90% concentrate and 10% alfalfa, straw, containing 2.45/ucal ME/kg and 160g CP/kg. There was no significant (P>0.05) effect of Yucca schidigera powder on fattening performance of lambs under our feeding regime with a diet containing high level (90%) of concentrate.

Comparison of yield, nutritive value, and in vitro digestibility of monocrop and intercropped corn-soybean silages cut at two maturity stages

Limited information on nutrient composition and in vitro digestibility of corn-soybean intercropped silage is available. The objective of this study was to compare corn (Zea mays L.) or soybean (Glycine max L. Yesilsoy) monocrop silage with corn-soybean intercropped silages in term of yield, nutritive value, and in vitro digestibility. Intercropping was as follows: 1 row corn to 1 row soybean (1M1S), 1 row corn to 2 rows soybean (1M2S) and 2 rows corn to 1 row soybean (2M1S). The crops were harvested when the corn reached 3/5 or 1/4 milk line. The silage samples were analysed for pH, dry matter (DM), crude protein (CP), ether extract (EE), neutral (NDF) and acid detergent fibre (ADF), calcium, potassium, magnesium and phosphorus. Also, in vitro true (IVTD) and in vitro NDF (IVNFD) digestibilities were determined in the silages samples. The DM, EE, calculated non structural carbohydrate values were higher in silage harvested at 1/4 than 3/5 milk line. All intercropped silages had higher CP values (1M1S, 8.3%; 1M2S, 10.1%; 2M1S, 8.0%) than the monocrop corn (SM, 6.8%) silage. The NDF and ADF levels were higher for 1M1S, 2M1S and SM compared with 1M2S and monocrop soybean (SS) silage. In vitro true DM digestibility of all silages increased with maturity stage; it was higher for the 1M2S than other silages. It is concluded that corn-soybean intercropped silage has better nutrient composition and digestibility than SM or SS silage.